I wasn't even aware of a stand like this. If not for the height-adjustment deficiency (AND angle adjustment), I would consider this the world's most perfect stand because of the "pedal" space down below....and the clean aesthetics.
That height adjustment problem has to be a real "problem" though. I know on my A-frame stand I would be lost without the completely variable height positions.....and the "angle" as I play just slightly off of horizontal.
On my A-frame stand I have complete versatility....add as many tiers as I need, height and angle adjustment, and tons of floor space for any pedals...particularly if you're using bass pedals (I don't use bass pedals though).
On the plus sign, I'd use these Quick-Lok stands for anything that requires "horizontal" position only (DJ table, mixer, MP3 player, etc) ....much better and more professional than hoping to find a sturdy chair on the job!
P.S. It amazes me that with all the companies making all these stands that none of them (including Ultimate Support) thought about bringing back to life the A-frame stands. They're not for everyone, but I'm sure they'd sell enough of them to make it profitable. I can only conclude whoever designs these stands (including the lack of the height-adjustment on the Quick-Lok one)...they're definitely NOT keyboard players!