Well spotted! I have the MSW-810S, which is the version with the TB-303 sequencer. They have stopped making them though, and now offer the regular MSW-810 as well as a version with MIDI input called MSW-810M.
My biggest gripe with it is probably the same as with the MC-202, namely that the sliders are shorter. The mod slider on my unit reacts a bit much in the lower range, i.e. the range from no modulation to too much modulation is pretty short. It might be that the original CMU-810 behaves that way though, I’m not sure since I’ve never used one. It can probably be fixed by changing a resistor value somewhere I guess. I also have an MC-202 (with a broken display, so I’m waiting for the Tubbutec mod to be released), and the MSW-810S sounds just as good!