I'd skip it. I had nothing but trouble with the Gossamer and my Ultegra build. I did find a Shimano R700 compact crank that I picked up from Bonktown for the same price as the Gossamer. Quality is as good as Ultegra...it looks good - and it works ***flawlessly***.
My LBS's mechanics all confirmed after the switch that the Gossamer isn't good and they'd seen many customer issues.