I used to sell these things, I mean alot of them probably about 50000 peices a month easily I can tell u that princo's are not as good a disk as ritek. If you actually analyse the write quality, the riteks will win easily. Make sure you have the latest firmware on your dvd writer. Also note that each writer has different issues with different branded disks. Eg Sony/Liteon (they are the same drive) will be different than NEC/Pioneer (they also are pretty much the same) . Im not too sure which is the best drive right now but 3 months ago I bought a pioneer cause it was the best at that stage. After selling princos, I myself wouldn't use them. I only use riteks cause they are the cheapest high quality stuff out. Also be careful with dodgy media, ie branded riteks that aren't really riteks, grey imports etc. just my opinion.