If you have spent any time researching desk ergonomics, you will have noticed something odd: the AmazonBasics monitor arm and the Ergotron LX look almost identical, cost wildly different amounts, and are made by the same company. This Ergotron vs AmazonBasics monitor arm comparison exists to answer the only question that matters — when is it worth paying roughly double for the badge, and when should you just buy the cheaper one and pocket the difference?
We have run both in our London home office for months, swapping the same 27-inch 4K panels between them. Here is what genuinely separates them, and which one we would buy depending on your monitor and your budget.
The short answer
The AmazonBasics monitor arm is, by Amazon’s own admission, manufactured by Ergotron and shares the same core mechanism as the LX. For most people running a single monitor up to around 27 inches and 8kg, the AmazonBasics arm does the same job for less money. The Ergotron LX justifies its premium with a higher weight rating, smoother and more precise tension adjustment, a longer reach, and a far better warranty. If you have a heavy or large monitor, or you simply want the version that will outlast three desks, the LX is the safer buy.
Ergotron LX vs AmazonBasics: specifications side by side
| Spec | AmazonBasics Arm | Ergotron LX |
| Mechanism | Ergotron CF (Constant Force) | Ergotron CF (Constant Force) |
| Weight range | around 2.3-5.4kg (single) | around 3.2-11.3kg |
| Max screen size | up to 27 inches (rated) | up to 34 inches (rated) |
| Max reach | around 510mm | around 640mm |
| Height adjustment | approx 330mm | approx 330mm |
| VESA | 75×75 and 100×100 | 75×75 and 100×100 |
| Mounting | Clamp + grommet | Clamp + grommet |
| Cable management | Internal channels | Internal channels |
| Warranty | 1 year (typical Amazon) | 10 years (Ergotron) |
| UK price | around £100-£130 | around £160-£200 |
The headline differences are weight range, reach, and warranty. Everything else — the aluminium construction, the Constant Force lift, the VESA plate, the two-piece clamp — is effectively the same hardware.
Build quality and materials
Pick both arms up and you would struggle to tell them apart blindfolded. Both use die-cast aluminium with a textured finish, both feel reassuringly dense, and both use Ergotron’s patented Constant Force (CF) lift mechanism rather than a cheap gas strut. This is the single most important thing to understand: the part that fails on budget arms — the gas cylinder that slowly loses pressure and lets your monitor droop after a year — is absent from both of these. The CF mechanism is mechanical and does not sag.
Where you can feel a difference is in the tension and movement. The LX’s lift feels marginally smoother and holds its set height more confidently with a heavier panel. On the AmazonBasics arm with a light monitor the difference is negligible; load it near its limit and the LX is the more composed of the two.
Weight range: the deciding factor for most people
This is where the comparison is won or lost. The AmazonBasics arm is rated to roughly 5.4kg for a single monitor. The Ergotron LX goes up to around 11.3kg. That gap matters more than the spec sheet suggests, because a monitor near the top of an arm’s rated range never feels as stable as one comfortably inside it.
A typical 27-inch IPS monitor weighs 4-6kg without its stand. A 32-inch or curved ultrawide can easily hit 7-9kg. So:
- 24-27 inch monitor, under 5kg — the AmazonBasics arm is comfortably within spec. Save the money.
- 27-inch monitor, 5-6.5kg — right at the AmazonBasics limit. Workable, but the LX gives you headroom and a steadier hold.
- 32 inch, ultrawide, or any monitor over 6.5kg — buy the LX. The AmazonBasics arm simply is not rated for it.
If you are not sure what your monitor weighs, check the manufacturer’s spec sheet for the figure listed as ‘weight without stand’ or ‘weight excluding base’. That is the number the arm has to hold.
Reach and ergonomics
The LX extends roughly 640mm from the mount versus about 510mm on the AmazonBasics arm. On a standard 600-800mm deep desk this is rarely a dealbreaker, but it matters in two scenarios: pushing a monitor right back against a wall to free up desk depth, or pulling it forward over a deep desk to get the screen to a comfortable arm’s-length distance. If your desk is deep, the LX’s extra reach is genuinely useful.
Both arms offer the same height range, full tilt, 360-degree pan, and portrait/landscape rotation. For day-to-day ergonomics — getting the top of the screen to eye level so your neck stays neutral — they are equally capable.
Installation
Identical experience. Both ship with a desk clamp and a grommet mount, both take a couple of Allen keys (included), and both have internal cable channels with clip-on covers. Budget 15-20 minutes for a first-timer. The clamp fits desks up to around 60mm thick. One tip that applies to both: tighten the VESA screws into your monitor first, then click the bracket onto the arm — it is far easier than trying to hold the monitor and line up the plate simultaneously.
Warranty: the hidden value gap
Ergotron backs the LX with a 10-year warranty. The AmazonBasics arm carries Amazon’s standard return policy and a typical one-year expectation. For a mechanical product you will keep on your desk for the better part of a decade, that is not a trivial difference. If the CF mechanism ever does fail, the LX is covered for years; the AmazonBasics arm is not. Factor that into the price gap before you decide the cheaper arm is automatically better value.
Pros and cons
AmazonBasics monitor arm
- Pros: Same Ergotron CF mechanism, same build feel, noticeably cheaper, perfect for single 24-27 inch monitors.
- Cons: Lower weight rating, shorter reach, short warranty, not suitable for heavy or large screens.
Ergotron LX
- Pros: Higher weight range, longer reach, smoother tension under load, outstanding 10-year warranty.
- Cons: Costs roughly 50-80% more, overkill for a light single monitor.
Which one should you buy?
Buy the AmazonBasics arm if you run a single monitor of 27 inches or less that weighs under about 5kg, you want Ergotron’s mechanism without Ergotron’s price, and you are comfortable with a shorter warranty. For a huge number of home-office setups, this is the smart-money choice and you will not feel short-changed.
Buy the Ergotron LX if your monitor is 32 inches or larger, weighs more than around 6kg, is a curved ultrawide, or if you simply want the longer reach and the decade-long warranty for peace of mind. It is the arm to buy once and forget about.
Our honest take: for most readers on a standard 27-inch panel, the AmazonBasics arm is the better value and we recommend it without hesitation. Step up to the LX the moment your monitor gets big or heavy — that is exactly the situation the extra money buys you out of.
Ready to mount? You can check current UK pricing here:
