All I can say is that with 10 degrees of flaps, ROC as measured by VSI is about 100 fpm better in my typical flight environments. Aviation Consumer, as well as the AA-5 owners I've spoken to, say the following:
"Takeoff and climb performance can be enhanced by ignoring book procedures, which call for flaps up. Some experienced Tiger/Cheetah pilots put down about one-third flaps when takeoff performance is critical."
http://www.randyarmadillo.com/flying...nsumer_1_1.pdf