I have had my NAD T955 5-channel 100wpc installed for about a week now and I thought I would share some thoughts:
First, build quality. Wow, this thing is a tank. I am also really glad I did not get the Emotiva as the NAD peeks out about 1/2in from the edge of my shelf, and the Emotiva was 3 inches deeper!
I have banana plugs on my mains and the other channels are bare wire. First, plenty of room to get back there and slide the wire in. MUCH better than my experience with AVRs. Next, the nuts are tough suckers. Heavy-duty plastic and, man, could I torque down on that thing with no give in the case or the mount. Solid.
Second, it had to really push my Blue Jean interconnects on. But no worries, here the build quality showed itself again. Unlike all the AVRs I have used in the past, there was no give on the RCA jack. Very impressive.
It is finally nice to have all of my channel driven off the same amp. Before I had a the Adcom GFA-5200 50wpc driving my mains and another Adcom driving my center and rears. Though the second Adcom was rated at 60wpc, I had it set for +8 on my center and +5 for my rears, which are much closer than my mains..strange.
Anyhoo, now everything is much more tightly integrated.
For my first test, I played some vinyl. I figured this was the best test as it the source I listen to most and it runs two channels for a fair comparison. I must say at first I was not overwhelmed. There was no massive difference. I was a little disappointed, but then I listened more. I began to realize the music was much more detailed. There was less "smearing" of the audio and I could being to really hear separate instruments. Bass was much more crisp.
Then I popped over to watching Dish. I was sitting with my wife watching the Olympics. I could not believe how clean everything sounded. I am now really appreciating the joy of separates. Then we watched some American Idol. My wife complained about the new system. She said to was too revealing, she could really hear how bad some of the contestants are!

(that's said, this year's Idol talent is really good).
I have also enjoyed some music and films. As of now, I have not had a chance for the amp to "stretch" its legs. As I like to listen to concerts at about 80db, my wife is a strong believer that music and film FX should be played exactly at just below audible.
That all for now, but the T955 for $799 is a great deal and I am very happy with the purchase.