Has anyone used one??

I'm considering this one, not for a surfboard but to carry my chair and umbrella to the beach,
hoping it doesn't make the bike handle too badly:

http://www.amazon.com/Carver-Surfboa...A1XKK94ISE43TH

The traffic here in the summer is just gridlocked heading to the beach, I only live a mile from the sand but it can take 30-40 minutes in the car. My new knee isn't quite up to being a pack mule for the walk yet, so I though some accoutrements for the bike might help.