Flash 10.1 on Froyo goes tete-a-tete with Flash Lite 4 on Eclair: butter vs. stutter (video)
http://www.engadget.com/2010/05/23/flash-10-1-on-froyo-goes-tete-a-tete-with-flash-lite-4-on-eclai/
Flash 10.1 looks pretty good to me considering it being in a Beta/RC stage.
Hmm... Engadget also says:
Ergo, our beloved handset got piping hot after about 30 minutes of heavy video watching, and the battery indicator in the upper right had a sizable dent.
Maybe not yet ready for prime time?