I just wanted to chime in and share my experience with Gophermods. I sent my 60gb to them in late August for a YLOD repair.
They did a reflow on my system and shipped it back within 24 hours. They send instructions on how to break in the reflowed system. Basically for the first 200 hours you can play in 2 hour increments, and then need to give the system a 15 minute break. I have followed those instructions to the letter.
As of this weekend I am just getting to the end of the break-in period and having intermittent YLOD again. Gophermods is willing to reflow the system for me again without fee, but I see this as only a temporary solution.
Dont look at their repair as a permanant one. It will give you some more time with your PS3, but it will fail again. I may end up trading my 60gb in to get a slim because of this recurrent issue.
The only surefire fix is to have the system reballed with lead solder. I would love to find a trustworthy company that can do that repair.