I have NHS hearing aids. Mine are over three years old but still great. I have had private hearing aids in the past, but wouldn't go down that route again as I have found my NHS aids to be more efficient.
I have bi-lateral NHS hearing aids. I have had them since 2003 & they are good enough for me. I have quite severe hearing loss. I am blessed with an excellent audiology department at our city hospital. They are open to walk ins without appointments for returning & repairs and also have a place in the town centre when I'm down that way. I would like to try private aids but the cost puts me off & if they were no better than my NHS aids I'd be very cross!