60 size has been good for me. And I love my OS engines. The OS .55ax in my Stinger II is an awesome combo! Flies just fast enough to get my knees knockin'!

Sometimes I choke on the price of glow fuel, but I can live with it for the simplicity of 2 strokes. I don't mind the glow slime so much...kinda like giving your horse a good rub down after a ride.