What do you like best?
Creo is a great improvement over Wildfire. It's a bit easier to resolve conflicts and dependencies, and has a slightly cleaner and more user-friendly interface and GUI.
I'll also say that Prints are much easier to create and build, and this is one of the best interfaces for creating 3-view prints.
What do you dislike?
Some of the non-default features (think swept helices and blends and the like) are a bit clunky to figure out. They're just not intuitive at all, and I think a few simple interface changes would correct this so that anyone could use it. Which is disappointing, considering there are free 3d CAD programs that do this well. Further, though resolving dependency issues are easier, I recall back in SolidWorks 2004 (a competing CAD package), that the software was better at assuming new dependencies when features or adjacent geometries were changed.
Recommendations to others considering the product
Know who your superusers are!
What business problems are you solving with the product? What benefits have you realized?
Engineering print creation, documentation, family tables, and revision management.