Haven't had any major problems with Poser 5, even before SR1 and SR2. It has been quite stable since SR2. I mostly do stills, occasional animations, use the hair and cloth rooms upon occasion. Haven't done much in the face room, aside from playing with it a little when I initially got P5. When I first got Poser 5 I was running a homebuilt machine with a Pentium 3, 800MHz, 80G harddrive, 768M RAM, and Windows ME OS. Have since upgraded to a new motherboard, Pentium 4, 2.4GHz and 1G RAM, everything else the same. And Poser 5 runs even better with the upgrade.