I've played a Series II before. I liked it a lot, thought it had a good range of tones in it. The clean is pretty awesome, but you know that already. The new Mesa clean channel is excellent.
I was surprised when I played it, because I was hoping for the amp to have the Mesa version of the British sound, and not just be Mesa's way of serving the Marshall type guys in the market, and I was satisfied. It "feels" like a Mesa, really sounds like what the ingenuity of Mesa with a British voicing mindset should be, not just a mock-up of a British flavor amp so they can make some money.