Initial Knee-Jerk:
Until at least a week searching reviews, records, specs, complaints...., I'm defaulting to Nope, not yet. Nice concept, but my immediate flinch to "No" is the vector of angular force in a position where the overall car is not perfectly parallel to the ground (and the ground of course being perfectly level as well).
The vertical leg (height) would have to always be kept lower than half the total length of the base for me to be comfortable under there. As it is, that means it's already higher than my comfort without even extending the mast as it's currently built. And I would be tempted to just get two complete sets for front and rear and ALWAYS keep both ends the same level.
Again, crafty inexpensive get-up, if bulletproofed against tipping over.
[EDIT]
Flash-,
I left all that intact up there for reference. But. Yes, a big But. Afterward I then watched the vid and ordered it anyway. For the price, I'm going to test it only as a replacement for my big (heavy-ass) Walker/Lincoln just to get the car in the air faster and easier, and then use my 6-ton stands at all 4 corners anyway. I'll likely never use the adjustable individual stands. Nice find and lead.