Bryston is tops for both quality and support, IME. A couple of years ago I called the factory to ask about a refurbished amp for my isobaric sub, and they put on the president!!!! He suggested a 20 year old design, recently refurbished. He warned that it was used, and not like new, but the price was only a touch over the used market. When it arrived, it was pristine, with a 7 year factory warrantee!!!!!
The Bryston powers the sub so well that it keeps up with my ESL’s (crossed over at 50Hz). And my 5 channel Bryston works wonders for the Magnepan HT. Maybe not the highest of high end performance, they don’t keep up with my DIY monobrlocks on ESL's, but the quality and service are out of this world. - day in, day out high end performance.