ORIGINAL: -pkh-
Yeah, I got a Spektrum AR6100 receiver that I planned to try out in a surface vehicle (with my DX7 transmitter). I originally planned to put it in a boat, but then I heard that people have had problems with the 2.4GHz DSS systems in boats (the water's surface supposedly screws up the range somehow). I might still try it in a car, but I like pistol grips better for cars.
Futaba's FASST system has been extensively tested in race conditions and has been shown to be very reliable. Other vendor's systems seem to still need work before they can be used in boats.