No need for PCM until you hit the Pattern/3D arena. I chose a 9CAF as my first radio on an LT 40,with S3004's in it; and the club members all concurred I wont need an upgrade for 10 years. I did however get a 6 EXA for my wife. (yep, shes gettin the bug too!) Gotta love a woman who is into RC too.