I picked up a Jarvis desk for my home office setup about a month ago because pandemic-work-from-home was causing substantial ergonomic issues. So far, I find that it‘s stability is somewhere between ok and good. I currently have an iMac and another display on the desk, plus (text) keyboards, iDevices, mouse, trackpad, laptop, etc, and I find that if I bump the desktop, or set my hands on it a little too hard, the monitors shake a bit more than I’d like.
It’s probably better than an Ikea sit/stand desk, but the sit/stand desk that my employer provides in my office is much sturdier (and probably cost at least 2x the Jarvis).
All in all, I’m happy with the purchase - the cost/quality seems really good (the local ergonomic office supply store where I bought my chair sells electric sit/stand desks as well, and their cheapest models is around €1000, while the Jarvis was only ~€600), but I wouldn’t say that it has great stability.
That Output/Jarvis-base combo looks fantastic though! In the studio, I just use a cheap ikea situation, and some wood on a keyboard stand, but there I’m not spending so much time staring at a computer monitor, so the ergonomics are completely different.
edit - one more thing to add - I actually suspect that with more weight on the Jarvis table-top, the stability may seem better, since the weight would potentially dampen any wobble resonances caused by bumps