I never use my seat post rack. I can't get it tight enough. I wanted the quick release so I can take it on and off. But it swings too much.

Another problem I don't think anyone else addressed is that it can get in your way when you dismount. If you have something perched on it, your leg can hit it as you try to swing it over when you are stopping.

If you want one bad enough, come to Great Falls, MT and I'll personally hand you mine at no charge.