I've been using DVD RAM for the past 16 months.
FOR: robust, stable, simple to use; disks in their caddies are practically indestructable; two sided disks 9.4 GB(actually about 9.32GB); rewritable for ever, my original disk has been overwritten at least 150 times with never a glitch. I'm so chuffed with DVD RAM that I have given up tempramental CDs.
AGAINST: slow writing and rewriting, will not play on household DVD players, initial cost of disks is high. Just the job for back up though.