I like a lot about Cornfords. I loved a Harlequin I played for quite a while in a shop. I love a load of clips I've heard. i really like their philosophy, who theyare, where they are, etc. etc.
However, my main experience of Cornford was buying a Hurricane 20W combo, which was just horrible. I'm suspicious that I got a bad amp, but I was just not willing to try again in the hope of geting a better one. I got my refund and ran.
In the end, the advice, given above, about playing an amp before you buy it is really important. Or at least buying from a place that gives you a 7 day return period (Anderton's in Guildford sell Cornfords and give a "no questions asked" 7 day return period).
I think that, potentially, Cornfords are awesome amps. But each single individual amp must be judged on it's own merits !!