It's not much of a slope, but the wind, when blowing the right way gets funneled into it and can produce some good upwards moving air. Mild days, I can work my little 3/4m Bug SAL on it and the last time I flew anything larger was my Thermic72 right as a storm was rolling in. I'd say gusting to 30 or so. maybe you can get a look at the little slope in the video bellow. It looks like I'm going to be taking that "go or blow" position soon as the wind does not seem to be wanting to play with me. Oh, and be warned, the plane in the video has a (gasp) tail on it.
At about 3:29 it catches a gust of wind and it's upside down and behind me before I can catch it and recover. It was a bit to windy for flying something that light, but I did have fun, and it was the first real flights I had on the plane. Taken with little key chain cam taped to hat so not the best aim.