"And it runs on Linux. I am so frustrated about CAD. The absolute best CAD I've ever used was Unigraphics, pre-NX around version 15 circa 1998. Before the sketcher crap. It ran on Unix. Unequaled to this day, and I've used just about everything. If I could just get back to that, I'd be happy."
I exited at V 10 Monty, yes it was the state of the art at the time.
The seeds of Parametrics were their if you wanted to use it (they had too, PTC was leading the way on it), I thought it was cool. Even more so it was also taught (very much like SW's) that you do not delete base geometry you started with or it could mess everything up in complicated models / assemblies. I really liked the User Defined Feature which allowed you to create an model within a model if you will, then make arrays of that UDF and keep the feature tree / model compact. Both got me in trouble with my employer at the time who was using UG as a 2D drawing tool, which were for legacy programs unless you were on the very limited new contracts ( I kid you not ).
I found SW's to be even more intuitive after opening up my mind to it after a ton of mistakes and perception of how I wanted it to work, not how it worked. During the tail end stint of my Introduction SW's Class they were bringing the Latest NX back as the Class and phasing out SW's. Many students had access to both. 2 very bright kids sitting next to one another picked up SW's on their own and did the exercises for UG w/ SW's it and said it was more intuitive and didn't like NX, that was an eye opener. It was now V20-something etc, and it changed so much vs V10 it was down-right clunky, not my cup of tea.