I've had my Shift rooted for several months now, and since then I've tried out several different ROMs. I've given up on trying to get an ICS ROM, and I can't use the 7.2 version of CyanogenMod because of issues with the bluetooth support (I rely on having my phone connected to my car's bluetooth system). No matter what ROM I choose, however, I tend to get frustrated after a few weeks, because they all seem to either lag or greatly drain the battery. I've gotten to the point where I'm only installing a handful of apps. Does anyone have any suggestions for very basic ROMs that eat up the fewest amount of phone resources? I may try the Just Works mod that's featured here, but I'm not a huge fan of Sense, either. It's still a few months before I can shop around for a new phone, but I'd like to get through that time with the least amount of frustration.