Ok, I've got both of these programs and I use them both heavily (along with Modelview) in making ships. However, there is one thing that bugs me... When I save a file in Aurora, and open it in PCS (yes, the newest version) I can not save changes. In fact, all of the data that I have loaded into the model, especially paths, is inaccessable in PCS and I then get a crash when attempting to save. I'm not sure where the error is (FS2 and Fred2 open all of the models without problem, but they sometimes seem a bit on the slow side) but there would seem to be a discrepency in the chunk handeling between these two quality editors. I'm not sure if it is widely known, or even if it can be easily addressed, but I just thought I'd say something.