Hi cbird, I have a ZR-1600, and it is a good pro amp. Not the end all be all in detail or resolution, but not bad. Lots of power, great control over the drivers, and a gain setting for each channel right on the front. As an audiofool amp, it falls just a little short imo, but ymmv. If you have a shop or garage system, the ZR-1600 would be great for that.
Hope this helps,
JCarney