As others have said, I started out with DroidMod and loved it. Absolutely no problems. Much faster than stock and much easier on the battery.
I recently switched to UltimateDroid, which is even faster than DroidMod was. BUT for me personally I'm having way more problems with UltimateDroid than I ever was with DroidMod. Nothing I haven't been able to fix after some tinkering, but if you just wanna toss something on your phone and have it work flawlessly, DroidMod is an excellent way to go.
Now that I've tried other ROMs, the only downside I've found of DroidMod is it runs a little warm. I was regularly into the 120s,often into the 130s. Now on Ultimate with Adamz low voltage kernel it is a STRUGGLE to get it past 110.