I broke my Nexus S 4G a few weeks ago (or, rather, it broke itself, and in the fixing I repaired the power problem and destroyed the speaker). I'm not sure if it's just the phone, or if Cyanogen contributed (I installed it almost immediately upon getting the phone), but that thing had awful reception on pretty much every kind of network, and the battery lasted less than half the day. Kind of a let-down for a flagship Android phone. Now I just wish that half the stuff you can do with a Nexus was available for something like the Photon, which has fantastic reception and battery life, but no CM.