I had my iPhone 2G 8G unlocked and jailbroken with T-Mobile, with just a few extras installed: Clippy, Winterboard w/ Mario SMS, transparent dock, reflective dock and Cyntact. Programs ran slow, quit unexpectedly and YouTube refused to work. Restored fresh 2.2.1 unlock only and this thing is snappieness to a T! Even battery life seems improved! LOVE IT! It's worth the wait for a 3.0 unlock for all the things you can get in Cydia if it means your phone will run smoothly and efficiently! Just thought I'd share my story!