Princo hasn't been know for good media since the day they entered the market. But... Princo discs are quite popular, as they are pretty cheap and work good in some DVD burners (and horrible or not in others!). The problem is, that these discs can easily go bad after some time (faster than high quality media) and make them useless.
Depending on your DVDR drive, you can use the media, but I wouldn't recommend them for storing any valuable materials.
If you do a search on Princo in the media forum, I'm sure you'll find lots of information on this brand and their discs.
I don't have any personal experience with this discs btw...