Sometime many years ago around the birth of the internet , there were usergroups that were a hold over from dial up technology. There were many discussions about this toy and generally all agreed it was slightly less dangerous than using an electric toaster in a bath ( with end resullts equally predictable ), If you check out the NTSB database you will see many fatal accidents for this helicopter that had a habit of losing engine power at worst time.
http://www.ntsb.gov/ntsb/query.asp#query_start
type in type helicopter , make mini and severity fatal .
Thankfully the last one was 2002 .