The Sugden Masterclass Series are wonderful sounding Class A amps. I would probably have bought one, if any local dealers had stocked it.
I ended up with a MF AMS35i, which is also fantastic and is better than the Masterclass integrated, but so it should be, given the price.
My advice would be, that there should be a big enough improvement to warrant a demo. Only listen if you're prepared to commit, as this amp may well get under your skin. 😉
I'm a Class A junky (SS & Tube), so take this into consideration when reading the above. 🙂