I didnt bother seeing how to back up the 1.00 firmware, and flashed mine up to 1.01 anyway.
So far so good. Speeds are still up there and I've had no issues (other than needing the newest version of Alcohol to properly recognize the drive, but this wasnt a firmware issue).
I don't do a ton of protected cd backups, I mostly do music ripping and huge amounts of general data backups with mine, and so far, so good.
I wouldn't mind having a copy of the 1.00 firmware though, just in case I do hit a problem later on. Just need to figure out where to get it from.
EDIT - I dropped Plextor support an email to see if they have a V1.00 firmware updater they could send me or let me know where to get it. In the past, they've always gotten back to me rapidly, so if I hear something I'll post it here ASAP!!!