I haven't used it enough to give a fair evaluation. It did crash on me while working with the new Procedural Terrains, but that bug is listed as fixed with the beta 5.02 patch. I had many crashes with Vue 4, but it got better with each new patch. Remember Vue on the Mac is still relatively new compared to the PC version. That said, I think you will find as stable as Vue 4 or a little better. This is not bad considering it is a new app and there are likely going to be several patches to come... As for OSX, as a long time Mac user, I can say that there is no comparison between OSX and previous OS versions. OSX is rock stable, for the most part. I think I can count on one hand how many times it has failed. Regards, Paul