I've got two headsets, one Avcomm AC-900, the other a Peltor 8006. Both are good - the AC-900 is slightly heavier than the 8006 but mre adjustable, and both are very comfortable. They work fine everywhere I've tried them except in one aircraft I fly, and even then it's only a problem if another person is using a set of DC's. I guess this is the infamous "headset matching" problem...
Cheers,
MD.