Hi guys, was using the spektrum system on my M8 & was impressed with it. I didn't have to worry about frequency clash during free practice, just switch on & go. Not even a single glitch too. Klang track is a haven for glitches which I believed many experienced too. The receiver is the size of my M8 std receiver & the antenna wire is very short & you can choose to keep it in the car without any range lost. Transmitter antenna too can be removed.