I haven't replaced mine again, yet, but both front and rear are squealing now. I still have two pair of the inexpensive resin pads I mentioned previously (I bought a set of four pairs), but I'm hesitant to bother installing them because I don't want to be changing them out again in a few months. (I only ride about five miles per day; I'm disappointed to be ready to replace after only about 500 miles.) Thus far, in my limited experience, I'm not enjoying the disc brakes. Although I've had rim brakes squeal from time to time, it was always an easy problem to fix. Maybe with more practice I'll come to view changing the disc-brake pads as a trivial task, but I'm not there yet...