It's worth mentioning that Bose offers a 30-day money-back guarantee, so you can try before you buy. Also, if your headphones break for any reason, Bose tends to be pretty good about replacing them.
Compared with our memory of the old TriPorts (the "AE1," if you will), Bose has improved the sound on these new models. Overall, the headphones are very accurate and offer good, well-defined bass. We threw a bunch of tracks at them, including some Elvis Costello, Bruce Springsteen, the Rolling Stones, the Kings of Leon, some classical tracks, and a Brooklyn band called The National. The only small gripe we had was that--because these headphones are as detailed as they are--they tend to come off sounding a tad brash, overemphasizing instruments such as cymbals (it's a matter of taste whether you like that "extra sizzle" or not). They also make poorly recorded music sound worse because they accentuate the flaws in the recordings (the flip side is they make good recordings sound very good).
That small knock aside, we thought they were very good. Are they the best-sounding headphones we've tried for $150? Probably not. But the combination of their high-quality sound and excellent comfort level make them easy to recommend, especially to those who don't want to spend $300 for the QuietComfort 15s. Yes, the 15s do a better job at blocking out more airplane engine noise, but the AE2s are arguably more comfortable and cost half the price.
Freelancer Steve Guttenberg contributed to this review.