I used WM which was terrible, BB Curve that was great for email and messaging but had the worst web browser known to man, iOS starting with iPhone 3G(who buys a $600 phone with no 3G anyways?) and Android on HTC Evo(nice phone but awful battery life),Epic 4G(amazing screen but crap GPS that was never fixed) and Photon 4G that was also very nice but unlocking the boot loader killed 4G and Motoblur is complete crap. Currently I'm using iPhone 4S and while it's a great phone some aspects of iOS namely retarded file system are driving me crazy. I'm probably going to end up going back to Android if I can trade my 4S for Galaxy Nexus.