When I owned the SM-70 Pros, which was a few years ago, CC Poon himself said the SM-70 Pro sounded better than the SE-100, which he only built to reach the 100 watt level some people require. The MK2 version may have changed that equation, although I think he's upgraded the SM-70 line recently too. CC was pretty good about answering questions, and I had a lot of them, so I'd suggest writing Monarchy.
I really loved my SM-70 Pros, but they were a little noisy once I got my Druids. With lower sensitivity speakers, they were terrific.
David