You just don't see spectrums regularly outside the U.S. I'm lucky to have attended international euros and worlds events around the world both on road and off-road. Certainly in on road there are very few. I think at the worlds in thailand (200mm) I saw one DX4 radio out of 100 competitors. That DOES say something...

Yes I am a Sanwa/Airtronics fan boy and for very good reason. The kit is first rate. I pay for all my kit as do most and I wouldn't be wasting my money on something I didn't feel and believe was superior in many aspects. The difference for me between Futaba and Sanwa is just the feel against other brands its a different story. I've been bashed a few times by spectrum fan boys but I don't care - truth hurts sometimes!

Radio is just something you don't economise on IMHO.