Used a Sidekick, Blackberry 7290 and 8700 and now the e61. The e61 wins as best all around device.

The SK was easiest to use. The BB was easiest to setup and use email. The e61 blows everything away in features, phone sound (typical stellar Nokia RF perf) and screen. The screen is fecking huge  

if you are considering it.... I vote two thumbs up!!