Has anyone had any experience with this product before? I have some questions on this and was hoping someone had used this before..

Info is here:

http://www.naturestonefloors.com/

 

Some questions I have...

Comfortable to kneel on / lay on to work on cars?
Jack stands no problem (stones coming up/chipping) assuming normal
(careful) use?
Oil splashes/spills during an oil change: animation on the web site shows
the floor's ability to drain water, such as during winter use (snow
melting off cars). If oil gets down in the rock, the only way to get it
out is to wash it out, at which point, the oil is now distributed all over
underneath the floor, and will eventually run out onto the driveway, into
the water drains, or it will just sit underneath the floor for a long
time.
Thickness of install: Site shows 1/2" to 3/4" height. Can a typical garage
door seal absorb this change in height?
Do they thin it out at all at the edge of the garage of it there is now a
3/4" lip to drive over?

 

I'd give it a pass for a working garage floor as there are so many other products specifically designed for that aplication. It's probably great if your garage is more a showroom than a workroom.