I have a fly sky gt3b, it is an ok radio. I had my hacked to the .50 firmware and disabled the channel 3 to increase response time. I did not notice much lag, but I wanted an airtronics so I picked up the MX3-X. First off, the flysky is way easier to program. Not that the MX3-X is hard, but it was just easier. The MX3X felt better in my hand though. I cant really explain it more than that. The backlite on the Fly Sky was very night and it has ABS, but the deal breaker for me was the trigger. I had noticed that the Fly Sky was hitting full throttle at 3/4 trigger pull. This was before and after the hack. I calibrated the radio and the esc and it was the same. The Airtronics uses the full trigger range. And it gives me a much better feel. I dont us ABS, so that missing feature is not biggie, but I do miss the back-lite.