The short answer
At this price the FlexiSpot ClassicRiser M2 and AlcoveRiser M7 are the two worth buying. Both publish 19.7" of maximum lift and a 35 lb weight limit, both have a separate keyboard tier, and FlexiSpot is unusual in publishing how tall a user each one fits. The compromises are the 5.9" seated floor, the 35 lb ceiling, and less clearly stated warranty terms than Vari's.
What the budget tier buys
A surprising amount, and this is the one place in the whole sit-stand category where cheap is not obviously worse. The ClassicRiser M2 publishes a 5.9" to 19.7" range — more maximum lift than the VariDesk Pro Plus 36's 17.5". The AlcoveRiser M7 publishes the same 19.7" on a 35" x 23.2" surface.
FlexiSpot also does something we wish everyone did: it publishes fit guidance tied to desk height. On a 28" desk the ClassicRiser accommodates users up to 6'1"; on a 31" desk, up to 6'5". That is a real, checkable claim, not marketing.
The three compromises
1. The seated floor
The ClassicRiser bottoms out at 5.9" above your desk. That height never goes away. On a 29" desk you are now typing at nearly 35" while seated, which is high for anyone under about 5'10". Raise your chair and use a footrest, or accept the shoulder shrug.
2. The 35 lb ceiling
Both publish 35 lb. Two 27-inch monitors with stands often total 24 to 36 lb, so the M7's dual-monitor pitch is genuinely tight against its own limit. Weigh before you buy.
3. Warranty clarity
Vari states a lifetime warranty on the Pro Plus 36 in plain language. FlexiSpot's converter terms are shorter and less prominently stated. If a decade of coverage matters more to you than the price gap, that is the argument for spending more.
What to avoid outright
- Single-surface risers. No separate keyboard tier means your keyboard ends up at monitor height. This is the single worst thing you can do to your shoulders, and it is the defining feature of the cheapest products in this category.
- Converters with no published weight limit. When the real limits are 24 to 44 lb, a missing figure is not an oversight.
- Arc-lift designs. If the platform swings toward you as it rises, your keyboard ends up in your stomach at standing height.
- Anything requiring you to drill your desk at this price. Reversibility is most of the reason to buy a converter.
And if the budget will stretch a little further, compare against the budget full-desk tier before deciding — around $400 the calculus changes.
How we picked
Desks we put on a test rig and measured: none
Plenty of sites imply a lab. We don't have one, and we say so. One desk here is genuinely owner-tested — the UPLIFT V2 that Mike bought and works at daily. Everything else is chosen the way an informed buyer would choose it: read the maker's spec sheet, manual and warranty terms; record the figures that decide whether a desk fits a body and stays still at height; check whether replacement parts are actually sold; then score each pick against a published rubric.
Scores are editorial judgments from that documented research, not lab results, and every product is labeled owner-tested or researched so you can weigh it accordingly. Nobody pays for placement. The rubric and the weights are on the How We Pick page.