I just got my PX-716A today through newegg.com and the drive is really great, I've burned 4 DVDs with no problems.
Anyway... I'm posting 'cause of a concern I have about the disk tray. Whenever the tray opens it comes out pretty smooth and then not so smooth more than half way through of it opening. I can't really explain it that good, so included a video to show what I'm talking about.
I don't know if it's normal or not, so I'll need some feedback, so I can exchange it before it's too late.