Audio Research DS 450 amp......thoughts

....that's what I'm looking for, thoughts on this class D amp from this tube giant. Some people like like it.....what do YOU think if you have heard it
I came very close to buying it. My local dealer didn't have the DS450 for me to demo, but he did play the DS225 for me with some Proac speakers. I thought it sounded impressive, but in the end, with so many quality SS amps out there, I just didn't want to drop that kind of money on a class D amplifier. (Ended up buying a simaudio evolution W8). During my research, I did get a chance to speak to one of the head guys at ARC (forget his name), and they are quite proud of their DS amps.
I purchased the DS450 (along with the LS27) about 6 weeks ago. Did extensive listening including McIntosh and Ayre. Found the transparency, musicality and soundstage on the DS better to my liking. The McIntosh had a deeper bottom end - but not by much.

I'm driving a pair of Revel Salon 2s with the DS450 and I'm very happy with the results so far.