I've said it before, and I'll say it again, cheap media is NO DEAL. I only use Taiyo Yuden media now. Been bit way too many times with others. The only place I buy TY media is www.rima.com. It's been said time and time again here by many others beside myself, Rima is probably the very best source for TY media, then www.supermediastore.com and www.newegg.com. I won't even settle for Ritek as, the very first 50 piece spindle I bought was totaly defective.
As far as whether or not your data will stand the test of time on the media it's currently on, I personaly wouldn't trust it. Even though I've switched to the finest media on the planet, I still make redundant backups that don't get used unless my working copys begin to fail. They stay on spindles in a cool dark closet. If I need to fall back to the backups, I immediately make yet another backup. This rarely happens now.
If you buy cheap media and end up loosing your data or having to make a million backups as a result, how much money did you really save? Taiyo Yuden media really doesn't cost that much more than any other "quality," media, and I find it a real bargain for peace of mind. Also, I don't have to worry about looking for country of origin, worrying about getting bad batches or what media codes I'm going to end up with. Nor do I waste a bunch of time and gas running all over hell's half acre looking for, "Made in Japan," media. I simply go to Rima, order the media I need, and pay for it. End of story. I don't have alot of money by ANY streach of the immagination, but I will spend what I need to in order to assure I'm not wasteing what little money I do have to spend.