Are you talking about the companion series? They're fantastic. I have series 2, and love them. Being Bose I think they're overpriced, but they don't under-deliver by any means. The Sound quality is terrific.
The only con I have is no matter what I try, I can't prevent my iPhone from freaking them out with interference. I've put those magnetite whatevers on the cables, set my phone on an anti-static bag, nothing I've read about seems to work. But the 3G phones shouldn't be a problem as 3G doesn't cause that interference like 2.5G does.