Ever since I heard the burson 160D, I have not been a big fan. Granted I haven't heard the soloist yet and I'm sure it's better, but the 160D was on a completely different level to the M5/6/8 imo. For the money, audio-gd eats it for breakfast.
The burson is not a bad amp at all, it is just very overpriced imo.
Each to their own.