Both of my bikes have sloping tops. I don't mind the look, and I appreciate the big standover space on my typical ride, which will include climbing over curbs and easing my way over minor obstacles like rocks, ledges or fallen branches on the trail. Kona makes all of its bikes with sloping tops, IIRC, and claims the resulting geometry allows for a better balance of ride comfort and control. I don't know about that, but I don't think there are any functional drawbacks to the sloped design. No big deal, but it is a bit easier to live with.