I'm building my mom a bike like this so she doesn't have to think about chaindrop. I had a wreck cause my chain dropped while turning and I ran into something huge, not going into details here. It hurt cause the bars when straight into my chest and left a red bruise for two weeks, I also went into the ground sideways since I was in my clips. I'm sure it was kinda funny to spectators. Needless to say I told her this and she was considering not biking at all so I came up with a 1x7 setup for her. Also, I no longer trust volunteer bike shops in my neighborhood. I went to sheldonbrown.com and learned how tune my derailleurs. I have not had a problem since.