Two-leg standing desks are very wobbly. You should offer a premium model using a four-leg design, similar to DeskHaus's [1]. I don't represent them, but I do have one of these desks.
That’s really more of a function of build quality than anything fundamental. Since the linear slides and screws are the most expensive part - I think you’re adding unnecessary cost by going to four adjustable uprights
If that is the case, no brand has high enough build quality. We have tons (literally) of multi-thousand dollars desks from Steelcase and other high-end brands - all of the two-leggers wobble.
I've worked on a 2.5 meter wide German slip roller which adjusts in a similar manner and sits on two legs. it uses nice heavy bearings and screws. you would break your arm before you detected any kind of wiggle.
It must be, because I've used one and it produces an unacceptable level of wobble. It's not much by itself, but if you add monitor arms and such, and raise the desk, it is quite noticable
I must just not mind it, because I've got two 30" monitors, one on an arm and one on the desktop, and another arm that holds my personal laptop above my work laptop -- so a lot of stuff on my desk.
I have the Fully "extended range" model, maybe 6" from the top height.
Yes, but it's the monitor arms that Uplift sells, so perhaps they've put work into keeping things balanced. I also have a third party arm that holds my laptop. It probably helps that it's solid wood (walnut butcher block, 1.5" thick) as opposed to the common MDF/particle board and laminate.
The Lumina team could consider this modification to add stability if that is an issue in their product’s usability.