A brief reply to the review by Alois: I by and large agree with his review, except when he says the amp lacks power. I have an ampeg b2r (350W) amp head and this hughes and kettner, so I was able to compare both: The b2r is more powerful, with more lows, but to say that the hughes and kettner is only 150W, is an exaggeration. I don't think the difference in terms of SPL is that big, the 300W it's rated at aren't false. At a gig together with a punk-hardcore band, their bassist borrowed it from me and I can tell you it really kicks ass (although I must say he had a music man with a 8x10 ampeg, very good gear, indeed: But the amp head did a very good job, all the same)!
Compared to the b2r, it's true that the hughes and kettner has less lows, it doesn't have that particular tone the ampegs have, full of low mids. It doesn't have that really fat sound of the b2r, but ti's not cold; I think it sounds very nice when you play certain notes, with a less intrusive personality than the b2r, more subtle. It's more discreet (which doesn't mean it doesn't have a personality of its own) but, at the same time, it's more precise than the b2r. So it all depends on the sound you are looking for.