No problems. I had backed up the info off the old PS3 before the YLOD was permanent.
I didn't even bother to start up the PS3 before I installed the hard drive. Just bung it into the caddy, bung the caddy into the PS3, start up the PS3. IIRC you do have to tell the PS3 to use the HDD and not the onboard 12GB memory. After that, it auto-installed the software and I was good to go.
Been up and running three months now.