I've had a bit of time to play with this firmware and these are my findings:
If you upgrade to USON, it is VERY VERY persistent!
1) If you use this firmware, it will not allow you to speedhack it, and change the write speeds to what you want.
2) If you use this firmware, it will NOT allow a 812 to 832 conversion....
Seems like LiteOn has written a firmware to not allow what it doesn't want........ as far as I'm concerned..... stay FAR away from this firmware....... stay with the US0J... I have flashed back to the J version.......
1/ You can speedhack it. Have you seen the very latest XFlash-X? ;) Anyway, Dan already got the latest burn-adjusted US0N from my website, and you can directly speedhack that, if you don't want to use XFlash-X.
2/ You can still go to a 832S after getting this. There's nothing stopping you. I'm still regularly jumping between US0N and VS__ right now as I'm doing some tests.
3/ My personal recommendation is to go ahead and get US0N. It's a great firmware with many improvements. There's no need to make the 832S conversion yet because DL media is not available, and by the time it is available, VS01 would be horribly outdated (it already is pretty outdated...)