Well, I'm at about 20 hours of use and I've tried it on 2 systems - both G4/OS10.2.6/1G RAM, one a 733MHz, the other a 1.4G DP. I'm really pleased. The thing actually works pretty much as advertised! So here's a couple of thoughts: Stability: One crash so far, hitting the Delete key instead of the Return key to confirm a choice in a dialog (fumble fingers!) . I've had no conflicts running other apps, including Classic apps. I've loaded 4 15Mb UVMapped .OBJs and 4 Vicky 3s with the Hirez maps (no crosstalk!). I've also done a little something in each of the rooms (no animation though) , all without crashing but... Speed: P5X seems slower then P4 doing P4 things and the new stuff often puts a real strain on my 1.4G machine. On my 733 machine I found that the "big" DAZ figures (like V3 and the Mil Dragon) went from frustrating with P4 to maddening in P5. I'm not sure I'd want to run P5 on a 500MHz machine (but I'm not very patient person). No DP support. Bugs: The only major bug I've found is with redrawing P5 when another app covers it. Various parts fail to reappear when you return to P5. Doing anything that forces Poser to redraw itself (like changing rooms) brings everything back. A couple of minor problems with numeric entry and the Presets Panel often changes from the directory you're in to the default. But P5 fixed a couple of P4 Setup room bugs and now works with QT6. P4 Runtime and PC format: To get to my P4 stuff I just left P4 where it was and pointed P5 to it's runtime directory. P5 is now compatible with the Poser PC file formats. Old/New: Old Poser stuff works pretty much as it always has and the few changes are for the better (like the new Info dialog). Of the new stuff I like the Material Room best, it's pretty easy but can also be quite deep. But for a newbie to this like me, the other rooms sure seem too convoluted and littered with "gotchyas" to get good results. Fortunately, there's a number of very good tutorials done on the PC that work the same on the Mac. All and all, and so far, I'd give P5X a grade of B. Best; Dan