That ROM is identical to the released update from Sprint, read the first page.
Damage added SU & Busybox as far as I know.
As far as issues, yes, read through the thread, but some have been simple.
In contrast, I had a doozy! All I can tell you is it doesn't play nice with the 1.6.2 recovery, so I would suggest keeping your recovery to 1.5.2 if you want to use it. I tried to update it to the 1.6.2 recovery image and is where I had a problem. Now, it may or may NOT have been from the ROM, but basically there were folder permissions that changed and prevented me from flashing anything to the phone. It was able to be bypassed and I now have the recovery console back so I can flash any other rom or return to the official 1.5, not that I ever would want to... lol, it's comforting just knowing I can.
That said, the ROM is awesome, works well. All is as reported as with the official Sprint 2.1 so look there for what's in it.
2 things that are way different I have noticed... one is battery life while not in use is just ridiculously low, which is a good thing. I have also read that resetting battery statistics on the phone and recalibrating the battery will make it last like 3 days, lol... (Root Phones only) will try that tonight. Two is... I really don't like what they did with the Camera menu, but I'm willing to give it some time to get used to it. Other than that... I noticed in the People that there is no ability to assign a ringtone per individual? Am I missing something? lol... anyway, any other Q's, just ask...
Happy Trails!
EDit:
http://forum.xda-developers.com/showthread.php?t=681697