I have to agree, I have some hearing loss at the lower end of the spectrum as per my last audiogram, not much and not serious but still I'd rather not have lost it.
A good ANR is unquestionably worth the investment. I have a Bose A20 (my hearing loss started before I bought it) it's fantastic. I forgot my headset at work the other day and put on a Dave Clark 10.13 that they have a spare in the cockpit and the difference was incredible. Bose A20 worth every penny!