I have the Yakima Hold Up. Works very well. Bought used on Craigslist, got a very good deal on a lightly used rack. Keep in mind, if you take it on and off, it's very heavy and cumbersome. I injured my back when I didn't bend my knees enough.
But I love the simplicity of it. And my full suspension mountain bike will only go on such a rack (or on the roof.)
I would do it if I were you. Such a great invention.