Bryston vs Modwright?

I'm looking to replace my old power amp with a new one, in the $4500-5000 range; I'm running an ARC ref 5 SE that I got from a friend, and will be driving Dali helicon 400 mk 2s. I have been thinking solid state to complement the ref 5 SE, and have been exploring the Bryston 4bSST2 vs the Modwright kwa 100 SE. Anyone have experience with either or both of these amps?