I have no experience with the futaba, but I've had the spektrum dx for awhile now and I'm completely happy with it. I haven't had any problems, and the range is plenty for what I do. I had an fm before that, and where I usually bash I had a ton of interference - now problem is solved!
i have a futaba 3mp and i love it good build quality easy to use but if your more advanced it has lots of options too. i haven't had any interference problems but i i live in the middle of know where but when i lived in london i had no interference what so ever.
4x4
I am interested in the dx3.0 also. I am traded some stuff and getting one in the deal. I am just wondering is it at least easy to understand. ie not a steep learning curve?