I had the same set up, OS 120 & onboard. Very easy to take off, very easy to find the edge of the flight envelope. Stay away from crosswind situations. That downwind wing will stop flying in a heartbeat. Practice lots of touch and goes.

The best mod would be to make trike setup seen earlier in this thread. It does like to tumble over its nose. I also cut 3/4 inch around the bottom of the wheel pants to keep them from snagging on our grass runway.