The bose X makes things sound clearer and quieter, but don't offer nearly the hearing protection that other headsets offer. Simply because something sounds quieter doesn't mean that your hearing is being protected. Hearing damage takes place not just through the ear canal, but through sound and wave propagation through the bones around your ear.
If you really want protection, a DC type headset works best, and should be improved with attenuating foam such as the Oregon Aero hush kit and ear seals.
The Bose X is expensive. I have one, and it's served well, and held up well in some demanding environments. That said, I also use a Bose Quiet Comfort QC-15 with a UflyMic, and it works exceptionally well. It has the advantage of being available on the road to wear when commuting some place, or to simply listen to the computer of music player. It can do double duty during flight, too...for long, quiet legs, music can be input to the headset through the UFlyMic, which doesn't interfere in the least with communications.