I'm still learning Beyond, after being a long time user of LD2000/Showtime. What I really like is not having to create frames in one program, saving, then importing them into Showtime. It's all consolidated and I can just add stuff as I go along. If I suddenly realize I need another graphic or a trace, I can just do it and save it right there. No "switching programs". Not to mention, many effects can be done on the main timeline and not having to add a bunch of effects lines.
That said, I MISS being able to save a preview of a show as an AVI/video file and I kind of liked some of the color/extrude/warping features built into LD2000 that either I can't find in Beyond yet - or they weren't carried over.
-Bill