I bought my Peltor headset from Transair when they were in Staines (20+ years ago??) They fold away in the bag, I can wear them for hours without undue strain. I find David Clarks unbearably vice-like and rather heavy. I'm told the electrics on the older Peltors like mine are a bit crude but they've updated them. That said, I've never had compatability problems with other makes of headset in a variety of aircraft.
I recently thought I'd treat myself to a new headset as the earpads had become flattened over the years and were no longer comfortable. Transair sold me a new pair of earpads for about 9 quid - seconds to fit and just like new!
The Odd One