I'll give Bose the thumbs up too. The only downsides I've found is that the mic sidetone isn't very strong (it's loud and clear, but sounds a bit "hollow" for lack of a better word) and that I have to tilt my thick-armed sunnies up at a weird angle to get 100% of the cancellation. You look strange, but it is worth it.
If you use decent rechargeable batteries, they last a long time too.