I just 'upgraded' from XTRsense 4.5 to XTRrom 5.0.1
The Eris loves this rom. It's smooth and snappy (as an Eris can be) way more than stock, that's for sure - and everything functions without glitches.
Hard to find much to complain about, really.
Alas, I'm such a techno-geek that I'll probably give up on this fine-functioning Eris for the new curvey Samsung when I'm due for upgrade in Nov.