Well, for what it's worth, although I don't have lots of experience. I have a (class A/B) Glockenklang Heart Rock which I love but it is heavy. I was delighted to hear about the Glock Steamhammer which is like 8 pounds or so and class D, ordered it and at first was amazed. But after long A/B comparison I realized that it has some digital/annoying quality in the sound. I know I am not biased because I REALLY wanted to like this amp, I don't want to lug 40lbs around. But it just felt like a downgrade. It has the much used ICE power amp that is supposed to be the best class D amp for bass so far. I've also heard the same digital aspect in other class D amps, like an Ampeg PF or even the Hevos clip above. My Heart Rock just sounds more natural and organic. I really want to like class D so I've got a Bergantino B|Amp on order, hoping that I just didn't like the particular amps. But I'm starting to fear that it's the power amp that doesn't do it for me. Mind you, I'm not talking about "slam", I felt that the Steamhammer had enough of that, even though the HR is supposed to be one of the great A/B amps as far as that goes. It also felt very quick and I liked that. It's just the sound that I found to be harsher. It wasn't very easy to spot but once I did I couldn't ignore it. And I'm really not "traditional" or anything, I've been a solid state fan in a world that worships tubes, I'm all for innovation, modern sound and clarity. I'm giving class D another shot with the Berg but if I find that harsh as well, it's back to the HR, or at least an A/B amp with more reasonable weight.