No need for pedal extensions, no burnt legs are two great reasons, full use of legs (can't sprint with legs splayed).High and far back, like where a massive human sits?Rack mounts are very stable, not awkward in the least, the only stability problem is sitting still on a kickstand (tip easy).The sound is behind you when riding.A rack mount can be connected/disconnected in minutes.Nothing to come apart BETWEEN YOUR LEGS.I'm bias, frame mounts look like c.r.a.p. wannabe motorcycles IMHO.My 2 cents,... of course will buy nothing.