I went from spectrum dx4r to a sanwa mt4s and the difference is incredible, mind you I thought the same jumping from a 4s to a 4r spectrum. I believe that the sanwa has a faster response time, so you feel more in control of the car. I really think it has helped me get more consistent. It has way more functions that the spectrum, but to be honest I will never use them, and reckon most other wont too. You can adjust the throttle in about 10 different directions !!!!!!
Not sure on difference between the sanwa and futaba but either 1 will be a step up from the spectrum, but remember the receivers aren't cheap so if you have multiple cars you will have to lay out around £60 for receivers.
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