I know that we already have a post about this ROM, but that's already two versions old. GSB 1.5 hit today, with the lastest CyanogenMod ROM 7 RC1 code incorporated. I actually haven't installed it yet, but will later tonight. It's supposed to need just a Dalvik wipe, but remember that if you flash the update, you need to immediately follow with the Google apps flash before you restart, and you should also re-flash the xtrcache2cache for Froyo if you installed that as well. Let us know if you've installed it and how things are running!