Hex was a disaster on my XP,W7 and Intel Mac as far as stability went. If I clicked Undo more than twice that was a death sentence, but everyone's millage may vary. I'm on board with Blender these days. The interface after 2.5 was a huge improvement and it's absurdly powerful, jut don't expect results overnight with any 3D app, they do not work the way your mind expects them too and expect to spend a few hours watching videos before you model anything with more than 8 sides.