I don't know about the XTD pressure plate, as I didn't use it. When I broke my ACT disk center hub, I had an XTD 6 puck disk laying around.
I stuck it in my MKIV, as there was a street car shootout at the track the next day that I needed to win. It is still holding right now(I have a new ACT disk on the shelf now), and has held for three trips to the track with mid 11 second passes being pretty common, and 501 ft/lbs and 587 whp on tap. This was also on drag radials, launching at 5 psi on the two step at 4100 rpm.
The disk drives better than the act one with less chatter and nicer engagement, and has been holding this power for a while now. It also has about 3 K street miles on it, and does get driven in stop and go traffic.
I will report back when it fails, but for now, I'm very pleased with a clutch disk that I got for VERY cheap.