PCM wont cover up a problem such as glitching if a proper pre-flight engine on-off range check is done each time out. You will find a reduction in range during pre-flight in both FM/PCM if there is a problem. Now, the failsafe in PCM operation gives you options on how you want the radio to deal with signal corruption or total loss which are more options than one has with FM. PCM is a more secure data transmission if good, solid safe practices are followed, if not, the FM/PCM arguemant doesn't mean anything anyway. In the end they both will work well if properly set up, some environments however, such as gasoline powered helis, will benefit more from PCM. FM is like the standard seat belt in your car and PCM to me, is more like a 5-point harness in a stock car. Both can save your life but the 5-point harness is better in extreme situations. Mike