Levinson:
It just exudes luxury and quality to me. I love the way the buttons feel, the way the knobs turn, the displays, all of it. They sweat the details in my opinion. Pride of ownership is thru the roof. I also love the sound. It's smooth and refined yet open and detailed without being in your face. I also like the flexibility of the SW and .1dB volume increments.
Audio Research:
I've owned a couple of ARC preamps and enjoyed my time with them but never "fell" for them. They are excellent pieces but I always worried about tubes degrading which bugged me. I also think I just prefer a well executed SS preamp.
Bryston:
Again, just never really been blown away by their products but I know lots of people love them.