This is somewhat true. It’s certainly useable but the feel/response of the knobs could be improved. Sadly there’s no sign of Steinberg making significant developments for the CC121 which is a shame because It’s a good product but with a few tweaks for the software it could easily be a superb product.
I also have a CMC QC and yes, the feel of sweeping the EQ’s is quite a bit nicer but the downside is that you have to hold down a button (shift I think???) in order to change the Q settings and the EQ band bypass settings.
I use the CC121 for EQ control and I have the CMC-QC setup to control the 8 FX send. It’s a nice combination. If I had to pick one or the other it would be the CC121 due to the fader, the additional knobs/buttons and the volume control but it does cost a lot more than the CMC.