I was using 10.1b5f24 for a while, it was pretty good (lots of glitches, but FAST) Now, im using build 5g15, and it's GREAT. It still has some stability issues (not as stable as 9,a nd no where near as stable as 10.0.4) but it was lots of new cool stuff (Airport BS config, new Conlrol Pane setup, Scale Effect, Dock options, DVD Support [NOT encripted, though]) but the best is the SPEED!!! It's not quite as fast as 9 on my iBook SE 466 with 320 RAM, but it's getting there (slows down sooooo much when playing MP3s) Well, I'm getting 5g48 from my friend tomarrow, so I'll write in with that. (I have 5g27, but it won't install...)