I recommend this main shaft to advance users who barely crash their MCPX. The added rotational mass really helps to keep the heli very stable during hover. You might have to add just a tiny bit of either pitch or head speed on your transmitter due to the added rotational mass but it is worth it since the flight characteristics are improved. I rated it 3 stars because I bent it on the first crash while learning to fly inverted. Not a good upgrade for a beginner learning to fly their MCPX, great upgrade for the advance user who does not crash much or if you fly over grass all the time without th..

Rating: 3 of 5 Stars!