If you already have a futaba radio switching to spektrum will only make you life harder. I forgot my radio at home one day and had to borrow a dx4c. My lap times were off by over a second for fast lap and my consistancy went from a half second spread to a two second spread. It was straight up frustration. We have a local that can somewhat keep up to me that runs a dx4r and savox servos he almost always has radio issues that keep him from winning. Its even frustrating for me to see hom constantly have issues. Altho i got one buddy that runs a 5r and he never has an issue.