No doubt, they make an airplane sound like an airplane and not a chainsaw!

I think my only issue with 4-stroke at present is getting a consistent low idle. Still tinkering with the low end mix, though I think it will be much better after I have a couple of gallons of fuel through it. Using "idle down" on my transmitter settings, and I notice that I am able to get it lower and lower as I go along. But with all that torque the plane wants to continue flying an awfully long way before settling onto the runway.

-- Bob