I have a lovely pair of knee high flat black boots from last year but they're on their last legs and they aren't making them anymore (have investigated)
I can see why the Fly boots have been so popular but I prefer a smarter boot and have thin calves. I tried Duo a year or two ago and was disappointed with the quality. I want something black, reasonably smart, flat(ish), simple and nice.
I quite like these for over skinnies, leggings and with winter dresses but am not sure if the suede makes them really impractical.