I've also heard about it from and talked to a lot of people about it. Avemco Insurance, before they took a hiatus from writing new LSA policies a couple months back, wrote a minimum of 5 hours mandatory transition training into their premium contracts with pilots, stipulating, basically, this: "We don't care if you be Sully Sullenburger or Wiley Post incarnate. If you want us to insure you in your new LSA, you will get five hours flight training in it."
excellent piece written by Ed Downs for In Flight USA, in which he lays out the need, in particular, for veteran pilots to check the uber-confidence at the hangar door and give LSA full respect as unique aircraft with distinct behaviors.
Definitely worth reading if you're at all of the LSA = "little airplanes" persuasion.