With the higher pressure of the 410 refrigerant are more leaks going to happen in the system. I am not sold on the 410 refrigerant yet. It cost more per pound than 22 at this time. I have been to several schools from different manufacture's and they are pushing the 410 refrigerant. I have been brainwashed before and feel that I was the field tester for products that were the greatest thing since sliced bread. What experience has anyone had, pro or con, with the 410 refrigerant?