Cornford's Harlequin ,WTF?!

I was checking out some combos for upgrading my practice setup. ive always liked the sound of the cornford amps, so i thought i should check those out, i heard some samples at cornford's website of the harlequin, and they were awesome, so i took a closer look at the specs and i saw something shocking (since this amp is fairly big), it only haves 6 watts (Class A [i dont know what that means])!!! and for what i understand, this amp shouldnt be loud at all! (i understand, more watts, more volume) . I mean, like i said, i'd use it for practice purposes, but ...6 watts?!
Am i wrong with my "more watts=more volume" perception? Anyone have heard this amp in action?

Thanks