as I have looked very little into even the mini - haven't even looked into the larger models.. But, RP2K is right: the mini is JUST a hair under the maximum weight allowed so that you don't have to register it with the FAA.. the larger models would have to be registered and you'd have a on of red tape..
I don't know the exact range of the mini, but I think its around 6 miles.. I'll tell you this much, tho.. My buddy flew his about 100 yards from us and we couldn't see it.. you can track it with GPS and the camera monitor on cell phone, but its TOUGH to see once you get out a ways...
Friendship is like peeing your pants.. Everybody can see it, but only you can feel the warmth..