I've never handled an OSO but I've been wanting to get one and see how I like it. There just always seems to be something else I want to get a little more and try. The blade shape and all is really appealing though.
The Skyline is a really nice knife to pick up and for the price is an awesome deal. It is a very smooth opening, light, and tough knife. I traded mine off for something I wanted a little more and fully intend to get one back because I miss having it around.
In short, I have yet to have a Kershaw that wasnt, in my opinion, a quality knife. I did have a few that didnt appeal to me but even those felt and carried like good working quality. My only real problems with them are some of the funky clips and their blade finish but thats another topic for another thread.