I've got one, I crashed in it, and it held up well.
I didn't slide any though. my ground contact was all impact. I went down, hit my elbow on the ground, and didn't really even notice. my knee, which was unarmored, also hit the ground, and was bruised for a week and a half. There was essentially no damage to the jacket.
Crash details: I was on an '80 KZ1000 with kinda old, cold Metzlers, riding up the street at a bout 30 when a car blew the stop sign in front of me, I grabbed too much front brake and lowsided. Ok, come to think of it, maybe there was sliding. I wasn't paying much attention to the ground contact I was making, I was more concerned with the contact I was still moving towards with the car. Fortunately, they got out of the way in time. (And kept going, btw. Grr.)
One neat thing I discovered about the Phoenix jacket (which, while it helps, still sucks to wear in the Mojave in June) is that you can use it like a giant swamp cooler. I'd stop every 50 miles or so, and hose myself down, then get back on the bike and ride on, in nearly air conditioned comfort. Obviously this trick only works really well in a desert that encourages evaporative cooling--less effective in, say, Louisiana.
-Kawazuki