Currently for me, in the type of music I have enjoyed from v4.5+. V5 of their model is a regression.

I was very impressed with v4.5+ that I could get quite good songs evocative of Devo, Yeah Yeah Yeah's, Metric, etc.

Version 5 is currently harder (or I haven't figured out a way) to generate this kind of chopped/produced sound. It doesn't follow complex style definitions and tends to generate songs that are too slow and "smoothed" over.