if it sounds anything like the windsor head, it'll be great for the price. as heavier says, speaker (and possibly cab construction) will probably be the weak link... should they bring out a head version (like a valve junior head type thing), that'd be even more awesome EDIT: specially if they throw £50 off!
I'm dying to try one, that's for sure. far as I know, it can take most octal power tubes too, so that could be cool as well.