I did the CRC GDI IVC treatment today with about 11,500 miles on the truck. I don't feel any real difference so maybe the valves weren't that bad. I made sure to follow the directions on the can so I know I did it right. I also did plenty of driving after the 1 hour head soak so I also know I did enough driving. If anything it gave me a piece of mind because I know it works from the comments on here. The can did say to do it every 10,000 miles, but I still may get a catch can in the future. If I do get a catch can I'll do the CRC GDI treatment before installing it.
By the way, mine came with a tag that said to send it in with the receipt and they'll send a $5 rebate. Not much, but will give a little bit of that money back for the cost of a stamp.