I saw a trio of them turn up at a session in Edinburgh two weeks ago. They were very nice people, played some of their own stuff and joined in with a few Scottish tunes. My girlfriend later saw them in action in the city centre - there seemed to be some sort of turf war going on, with that trio and the larger and very much louder group that's been coming to Edinburgh for years facing off across the street. No idea what that was about.

The loudest groups (like those Edinburgh Festival regulars) are obnoxious arseholes. Nobody has any business using that much amplification.