Looks like you are getting plenty of support there too
http://club.cdfreaks.com/f86/ad-5200-ad-7200-a-263574/
I don't think the 5200 is a rebadged Lite-On or L&D wouldn't be supplying modified firmware for it ~ http://liggydee.cdfreaks.com/page/en/Optiarc-AD-5200A/
I don't remember the 5200 getting much praise in it's hay day, but the 7200 has recieved a lot of attention as you can see. Also the 7200 are getting hard to find in the states at the usual spots and I would look for them to be hard to find world over soon. I'm surprised the 5200's can still be found. I personally wouldn't get anything less than a 7200, but that is just my opinion.
Same hardware as seen below :
5200
7200