i have the miches. nice cranks. as i've never even SEEN 75's no real comment there. my bb had the same problem as erichsia's, but i wasnt that definitive with it. i would just make sure the spindles were tight and go ride. using a different bb now and no problems at all. i might change cranks just because i'm a terrible person and i want to buy something new for my new build and not use old parts. still remains to be seen though.