Uberwaltz -
I've been using one of the earlier Ice powered D-Sonic amps for around 5 years now and I couldn't be happier with it.
My main interest initially was that I needed something with enough power that I could use to push my Nautilus 800s that wouldn't require a second mortgage and would actually fit in my listening room.
Since I use my system for both music and home theater, I ended up going with a 7 channel unit with 2 amps driving each of the 800s. The modules are the 1000ASPs and are rated (by owner Dennis Deacon) at 575W/8ohm and 1000W/4ohm and stable down to 2ohms easily.
Only other option that I had considered to get the same power delivery in a non Class D design were 4 Classe CA-M600 monos. With the D-Sonic, I'm getting seven channels in a unit that's smaller than a single M600 - It actually fits in my standard rack.
I would say that what impresses me most about the D-Sonic (and good class D amps in general) is that at any volume level there's such immediate modulation that you can have a conversation with someone next to you in a normal speaking voice. It's very dynamic and very clean.
Some great class A-A/B amps that I've heard on the same speakers (including the Classe) were also very good but I prefer the Class D D-Sonic sound personally. The heavyweight monos that double output at load can give a lot of slam to be sure, but unlike the Class D their sonic signature often varies depending on volume unlike the Class D which sounds exactly the same at any volume level. Perhaps it's a matter of simply just having so much immediate current delivery on tap.
Given that you're considering D Sonic, I would have a chat with Dennis and see what he has to say. I was recently in touch with him, and he's very enthusiastic about his newer offerings and will gladly custom configure any setup that you may want or need and he also has a great return policy to reduce risk factor.
Take care
Greg