I'm on T-mobile. It's quite stable. It's crashed about as much as the Samsung stock ROM. You can back up your data (most of it, anyway) with Titanium Backup (av

I'm on T-mobile. It's quite stable. It's crashed about as much as the Samsung stock ROM. You can back up your data (most of it, anyway) with Titanium Backup (available in the app store, both free and pro). If your contacts are tied to your Google account, then they're automatically backed up anyway.