If you have a headset that you are really happy with then you may consider fitting an ANR kit into it.
www.headsetsinc.com make kits for most models, that can be fitted yourself in a few hours. Cost is under US$200.
Myself I have been using a Bose II for over 3 years and find the odd time I fly with my old standard David Clark painful.
Problems none, but new gel seals required every 6 months. Bought it with rechargable and non rechargable battery pack but believe that option isn't available on the Bose X.