There is already quite a sizeable thread (including some quality scans) about PX716A, at cdfreaks: http://club.cdfreaks.com/showthread.php?t=111839
To quickly summarise it ... it doesn't look good at all ... very poor quality on TY media at 16X (and not only) ... problems with PIPO scans on 716A which show significantly more errors compared with the same disc scanned on PX712A ...
Well, it seems to be a really bad start for this drive. Some people were dissapointed enough to return their drives!!! (I believe Jamos is one of them). It seems that Plextor rushed this unit on the market way before its time, as FW1.0 is rather bad and needs a lot of work ... hopefully fw1.01 will fix these issues ... but this might be quite a bumpy ride
So I'm afraid that "better than the LG" is right now in a galaxy far far away