If you have the fuel to burn then YS is the way to go . I flew my 170 CDI almost daily and was very happy with it although I was not able to get 15 or 17 minute flights as some pilots can and I believe it was because most of my flying is at sea level. I did switch to electric because I could not justify spending so much money on fuel as I do not have a sponsor. I am really happy with electric power and am not set to convert the pattern community to it. But I will tell you this: I still love flying glow but I don't see myself buying my next pattern setup as glow. And as for the flight times during practice I don't see myself hugging the sky for fifteen or more minutes when there might be others waiting. A good flight of five minutes at a time is plenty of practice...