Pros: cancels some noise, folds, airline adapter is great
Cons: sound like ear buds, too easy to leave switched on
Got these as a gift, sold them for $20 to someone who wanted noise cancelling. I warned them that the noise cancelling wasn't very good but they still wanted them. This will cancel an HVAC fan, or some traffic noise outside your building, but that's about it. These aren't Quiet Comforts, nor are they IEMs. These cancel noise like a shallow IEM with the dynamic range of a cheap ear bud. If for some reason you really want an on-ear headphone, not IEMs or over-ear, go with a Philips model that has memory foam. Frankly passive noise isolation is better than the active cancelling on these. You'll save yourself AAA batteries which you will go through very quickly because you'll always accidentally hit the on switch when putting them away.
However, they were reasonably comfortable on the ear, and if you really, really want active noise cancelling and don't care about sound quality, then these might just be for you. It also comes with an excellent, hard to replace airline adapter. And since these will be next to useless on the airplane, you might as well take out the adapter and use it with some IEMs!