All of my phones for the past few years have been Linux/Android
N900 > Milestone 2 > Xperia Mini Pro > Galaxy Nexus
Maemo was lovely but the device itself had problems. Motorola's customisation was horrific, as was Sony's but they have at least opened everything up so custom ROMs work really well. The Nexus I'm hoping will "just work". Gone with the Galaxy Nexus rather than the Nexus 4 as it can have an extended battery fitted - I'm a little tired of the battery life on just about everything nowadays.
Not particularly looking forward to giving up my keyboard though.