planemad_bk
Colleagues have Sennheiser HMEC-25. They're very happy with them. I've tried the Sennheiser a couple of times. Its noise cancelling properties are excellent and it is light weight. I don't like the small ear cup on the HMEC-25 which sits on one's ear. I found the HMEC-300 & 400 too heavy.
The Bose Aviation X which I purchased has excellent noise cancelling, gives about 100 hrs on AA alkaline batteries, and almost as long on rechargable batteries. The ear cup covers the whole ear, and whilst not as light as the HMEC-25 they're lighter than the DC H10-80 that the Bose replaced.
I'm very happy with my purchase.