actualy mine princos can be read up to 5 times i think, i dnt think any1 had ever watched a film more than that, and i only got 2 movies that i burnt for me with them... but the princo media that ppl lent me is usualy good, maybe you had bad experience with fake princos, i read this on their website (when i was looking for information on princo 8X): We hereby announced that we don't have any factory in China. If the goods you bought came from China, it's 100% fake goods. If you bought & sale this kinds goods, PRINCO will not promise any quality guarantee for you and we'll take legal action with who made or sale fake goods !!
it is on here
BTW i got plextor PX-130A DVD reader and PX-712A writer, that must be why i dont have much bad experience with princos, except have to trow away 10% of them bcoz they have some kind of error when i start to burn them, but they cheap, 10euros 50 princo "budget" (as if they were not cheap enogh)... look like i will have to spend extra 15 cent per disc to "copy protect" them...