I tried them out, and they looked pretty nice, but they were HORRIBLY slow on my PC. I did some googling and found out about the Option "RenderAccel" "true" setting. I tried that and it seemed to speed things up quite a bit, but myt X-Server constantly crashed. I disabled the effects - but left the RenderAccel setting on as it seems to make my desktop more responsive.
Anyone here using these effects and not experiencing crashes or slowness?