They sound is like a hopped up vacuum cleaner.

When I got my ducted fan I have never flown anything faster than a sport plane, the speed is not hard to handle in my opinion, its the landings that are pretty different, you need to learn how to slow it down better because they come in faster if you dont know what your doing.
What kind of fast plane did you fly? how many flights?
I have heard that the TopGunAircraft f15 is a good ducted fan.
TGAjets
There are some others out there too.