In the last 18 months I've had a mac 352,a MC2102,a MC275IV,C2200 and a MCD201
And now I'm the delighted owner of a new ARC 150.2
I've heard the Arc tube amps as well.
In my opinion the 150.2 is better in ALL respects then any of the Mac amps I've owned.
I also now own a ARC LS26 pre-amp,and a CD# mkII.
I feel these units are also superior.
I think McIntosh has fallen behind the current state of the art technology.