Merrill has been amazing to deal with. I need to conduct some more testing, but my initial impression and observations between the Magtech and the Veritas are that (1) the Veritas is quieter--both the unit itself and through the speakers. There's no tube hiss from my Audio Research Ref5SE. (2) The Veritas may be a hair more detailed with slightly better imaging. (3) The Veritas is more forward in the mids and highs and thus brighter. It's interesting that both amps are typically described as neutral because the Magtech sounds more laid back to me. As of now, I prefer the Magtech but will report back after more listening.
