As far as the volume control noise I mentioned, I probably should've been a bit more specific. Your model and the C31V have the digital control and I could hear it "clicking" every time I raised or lowered the volume with the remote. That annoyed me.
The problem I have with many of the older Mac amps is that they have the autoformers, including your 2155, and to me the bass is not as tight as I would like it to be. I can't speak for the newer amps, because I found the 7200 so satisfying, I saw no need to look further. The 7200, as you may or may not know, is direct coupled and puts out 200 wpc @ 8 ohms/300 wpc @ 4 ohms. The sound is tight and not dull, clear highs and I see no reason to spend a lot of bucks on something that may not be as satisfying as what I have. 7200's can be had for anywhere from $1200-$1500. I added the 17.5" wide face to mine, with the newer tapered end caps, so it looks like the current models, and matches my preamps.
The problem I have with many of the older Mac amps is that they have the autoformers, including your 2155, and to me the bass is not as tight as I would like it to be. I can't speak for the newer amps, because I found the 7200 so satisfying, I saw no need to look further. The 7200, as you may or may not know, is direct coupled and puts out 200 wpc @ 8 ohms/300 wpc @ 4 ohms. The sound is tight and not dull, clear highs and I see no reason to spend a lot of bucks on something that may not be as satisfying as what I have. 7200's can be had for anywhere from $1200-$1500. I added the 17.5" wide face to mine, with the newer tapered end caps, so it looks like the current models, and matches my preamps.