Well you know they all run good on a break in stand. Wait until you put it in a plane. I would rather pay more for an engine that is reliable and go fly, and not have to worry about it quiting on take off. I will admit Some I said Some of the MDS engines run OK, but there is a bigger % that don't I would like to know, if they are so good why is Horizon dropping the line? and in 3 to 4 years from know where are you going to get parts for one if you can?