An ANR module failed in my DC 10-13X last year after about 5 years use. Whilst it was away being repaired I tried a Bose A-20 & ended up buying a set, I could not go back & the repaired (FOC) DC's are now used by my students. As an instructor I received a 100Euro discount under Bose's 'Profession Pilot Appreciation program', applied for through Bose's European website and honoured by Pooleys, it may be worth asking if it is still available TOO.