I have an EZ Zero that I started flying in 1994. It's a great flying airplane! Mine was powered by an OS .45 2-stroke. I don't really remember balancing it, but I'm sure it wasn't a problem. It comes out very light so it was easy to take-off and land. I flew it in my first fun-scale contest and won first place!

The only problem I had with it was that it was kinda fragile. I don't know how the current ones are built but mine was a simple wood frame covered with a foam board (like a styrofoam cup). The cowel, fillets, and several other parts are plastic. When the foam board gets wrinkled or torn it is very difficult to repair it so that it doesn't show. The same goes for the plastic parts. They develop cracks after a couple years and don't look so good.

I retired mine after flying it for about 4 years because it was starting to look pretty rough. I still have it hanging up in my basement. I think you will be really happy with the way it flies. The OS .70 ought to work really well in it! Good Luck!