You know I had picked up this notion since first looking into the R2R11 that the mimby was a ''hybrid'' and not true R2R but you just made me realise that is completely wrong, I thought it could instead be that discrete resistor ladder R2R are ''better'' but I cant find anything saying that is the case either, what I did find is people praising the mimby for it's unique sound that even some of the most expensive DS DACs cant capture... so you are right then, it does exist after all!
As most probably already know there is another low cost discrete ladder R2R DAC, the Massdrop Airist Audio R2R DAC. about the same price as R2R11 plus the dreaded massdrop waiting times ... still good too see more R2R options hitting the market and it could be a great DAC, will have to wait for a comparison with the mimby.