I have an MPI reversing Y and an MPI Miracle Switch on my GSP Katana, I have about 80 flights on it with no problems. I also have the stock landing gear which is very durable, I have had several less than perfect landings and the gear has been torn off twice on two very hard deadsticks. The top hatch looks like a lot of work and the stock bottom hatch is a real pain. I enlarged mine, it was very simple to do and makes life a lot easier. Click on my gallery to see pics of the larger hatch. And no the covering on mine is not stock.