I bought these in Canada for $20 on sale. I travel cross-country regularly (4-5 hour flights) and these worked just fine (especially for $20), but the big downside is comfort. They became very uncomfortable after 1.5-2 hours on my ears. I've tried them on a few trips now, and although they block out the grumbiling noise on the plane, I can only wear them for relatively small chunks of time. My ears were killing me after having them on a 5 hour red-eye flight.
Recommend this product?
So, my suggestion is if you usually fly short-haul flights (less 2-3 hours) these are an outstanding buy. However, if you're a long-haul regular, you may want to invest in a more comfomfortable (expensive) pair.