I completed mine last year and have completed my first annual renewal form today. I think it's a real advanatage to have the record. It serves as a record, of course, to your education, experience and references so you do not have to hunt those parties down each time you feel the urge to sit for a exam. I know some states require a record, better check on that. I haven't needed to transmit my record to another state, but will, as I am in the process of starting to prepare for my PE exam hopefully in April 2011. When that is complete I will try to start getting states that border Tennessee. Each renewal year you have to update your record for the past 12 months and turn in a new RLS/PLS reference. Pretty straightforward and easy.
Good luck,
MD