I've had the 580XD (10.5 degrees) for a couple of months now. I couldn't hit it straight with the stock shaft, but once I found the shaft that worked for me (Apache MS40+ firm) it is the longest, most forgiving driver I've hit. It replaced a Callaway VFT driver, and outperformed most of the new Callaway drivers I've demo'd.

Some of my friends have used it, and most like it, but some have remarked that the head is so big it distracts them.

Personally, I don't see it coming out of my bag in the near future.