I'm a little late to the party but here are my impressions, positively, of course:
-Game runs as advertised by Sakurai. 60 frames, silky smooth. Both versions.
-Responsive controls, did take some getting used too, but very promising. (Pro controller @ Best Buys)
-Smash Run is a lot more fun than I thought, will be even better with other human players instead of CPUs
-Music was excellent, especially the remixed Smash64 Character Select theme that plays at the results screen.
-Smash Ball took a bit more abuse to crack open. This is a good change IMO