I owned both the MF2550and Rogue RP5. I currently own the McIntosh C2500. I love the C2500 and the RP5. I never used either with the C2500. I didn’t really care for the CJ MF2550 but I was using it with the AI Modulus 3B preamp. It sounded very slow. I was driving GE Triton Reference speakers. I did try the Rogue with a Mac Solid State amp and it was wonderful. I am currently using a C2500 and a Mac MC302 amp. If you like the sound of theCJ, then you will love it with the C2500.
I purchased the C2500 mainly for its tone controls and the ability to change the MC cartridge loading on the fly via remote. The C2500 is my last preamp. It is also dead quiet. It has plenty of inputs and outputs plus a processor loop which I needed. I experimented with boutique tubes but went back to the Mac branded (JJ) tubes as they worked best for the music diversity that I like. It is a much better preamp than the Rogue which I did like very much.