I happen to have both a Jarvis desk I bought 3 years ago, and just recently bought an UpLift v2 with the commercial crossbar package as an additional desk in my office. Both sit next to each other, making comparison easy.

I was content with my Jarvis until I received the Uplift. Stability comparisons are night and day: Uplift (with crossbar) has vastly superior stability at standing heights. The Jarvis has noticeable sway just using a keyboard and mouse, while the Uplift remains stable even when pounding on music gear. Both are stable at sitting heights. I found accessories (such as cable management) to be better with Uplift as well. It is enough of a difference that I am considering replacing the Jarvis with another Uplift desk in the future.

To Jarvis’ defense, I am comparing their 3 year old product to their competitors’ product I bought 1 month ago, and the overall desk experience with Jarvis is still good enough that I’m in no rush to replace it. I will be only buying standing desks with crossbars from now on, though.