I added a Samsung 830 128GB (MZ-7PC128B/WW) and experienced the same problems as Brett with only 1 screw holding the antenna and the SSD lying in the mac mini without any screw holding it; shook it too and seems nice though. I cloned the old system via carbon copy cloner, after reseting the parameters via cmd + alt + p +r on start-up everything is running preety fast. Update: Just added upgraded another two MacMinis with Samsung 830 128 GB SSDs. Everything went well, all screws fit this time, didn't have to remove the logic board as well.