I've got a sinfonion too - absolutely love it - currently feeding it with a combination of sequencers - Marbles, BSP and a Pico SEQ (for changing song part - clocked from gate1)
I have just ordered a Tesseract Modular Fader Step - similar to Metropolis/RYK in lots of ways - but comes as DIY kit with smd pre-soldered for €120 - it has repeats like Metropolis from what I have heard - if I don't like it as a melodic sequencer (I can always use it for sequenced modulation) - no quantization afaik - but it's going into sinfonion anyway
I will report back once I have it and it is built (also on the tex mix, which I ordered at the same time)
I've only played with a Metropolis once for a few minutes in a shop, liked it, but always a lower priority than other things
Utility modules are the inexpensive, dull polish that makes the expensive, shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities