I just flew my first flights with a set of the Sennheiser PCX-300s. I was pretty happy with them on the transcontinental jets, but they couldn't do much to help with the din on the one segment on a US Airways Dash-8.

I haven't tried the Bose before, so I was curious if any NC headphones can make a real difference on a turboprop (something to make the two hour Dash-8 flights from ROA to PHL more bearable)? Perhaps the in-ear ones would be better there, but I think I'd find them uncomfortable on my longer flights.