I have a 34 with the Scheel keel. They put about 400 lbs more lead in, so that the righting moment would be the same as the deep keel. She is stiff and stands up well to her canvas. However, she makes a fair amount of leeway.
I have no trouble getting upwind, but I have to take an extra tack or two.
Another thing I like about the Scheel keel is its substantial thickness. I hit a wreck last summer, just a few inches above the bottom of the keel. The impact stopped the boat cold from about 4 knots. There was NO damage. The keel didn't dent or bend. The seal between the keel and the hull didn't break. The keelbolts didn't loosen or bend. The only sign of the impact was scraped off bottom paint.