I did a RH300 course and exam last week. It was easy enough, the troubleshooting part was a breeze (needed only 40 minutes for the 4 sessions, which included 3 re-installs for the various scenarios), the multiple-choice was easy enough, and I think I got the install part as well.
I'll probably know within a couple of days if I passed. It was fun though, and the course at IBM was well given.
Put my poldhu_cs sources in cvs on my laptop. I've been doing it all by hand (with a directory for each version). It's an improvement. :)