Possibly, they are a slightly different kettle of fish - depending on what you want it for.
The R4/Multiwash 440 is what a lot of carpet cleaners use but they are big, heavy units (although they do a great job). The R3/R2's (30cm & 20cm respectively) are a lot more manageable, but there's not so many of them around.
I've got an R2, it doesn't look as pretty as the cleanfix - I've put it in the shed until I'm positive that the cleanfix is the one to keep (vast majority of my work is domestic, and at the moment I've got 2 cleanfix's), as they can be used for agitating stairs which is more awkward with a CRB.
If you know what you want/how much you want to spend I'll have a look what I can source.