I had a couple of trial gyro lessons a while back, when I was looking for a cheap rotary alternative. They are great fun, and theoretically very safe; auto-rotations are unbelievably tame; you just sort of float slowly down to earth. The main drawback in my opinion is that they only come as kits, and I wouldn't trust either my own or someone else's self-build skills in something with that many moving parts. I haven't studied the accident causes in detail, but I do seem to remember that quite a few were caused by rotors falling apart or bits falling off. I think negative g is something you have to be careful of, but not a major problem if you're sensible, like in R22s. And I think it's because of the likelihood of mast bumping, again like in helis, but I'm not certain of that LowNSlow. The RAF 2000 is lovely to look at, but very cramped inside, relatively expensive, only cruises at 70kts, and is even twitchier to fly than an R22. Though I did only try to fly one for about ten minutes in a gusty crosswind, so that last bit may be an exaggeration. But if someone would sort out the problems with noise and produce a factory built version, I'd love one all the same!