I thought Plextor were build to last, nomatter what speed you burn at?
From my personal view, I think the "Plextor is best" days are over. It was back in the 90's, with the SCSI burners, where plextor got the nice feedback. Now I don't think there is much different in the hardware quality and support between drives.
I have a PX-130 romdrive, that has defects. This should be a know problem - the "klonk" sound that appear when you insert a media and close the sledge. Which sometimes makes it stop reading. I think its a known bug amonk PX-130 drives. It should be an original Plextor, no branding from others firms?!
What I'm trying to say is, that plextor needs to earn and sell as much as other companies. So they will probably do anything to put out drives and sell as fast as possible, nomatter how and things performs and works. Its a hard business. Trying to keep up with its good long times earned name - "Plextor". The quality has been going down, if you ask me.
My PX-755A still can't write good on my Verbatim DVD+RW 4xspeed medias, that I really can't understand? It has gotten a lot better with and update lately, but it still bad. My PX-708A is much much better in writing on the mentioned media. I really can't understand, why the 755a can't do a good burn on those medias. And I'm not the only one having that problem. I often has to deeply format the media, as it gets corrupted very quickly, after a few writings.
For me, that is also a sign of quality problems with the new plextor drivers. I think, I could get a much cheaper driver, that could possible do the burns without any problem s. I don't think Plextor is able to keep them self up among the drive competition, concerning price, quality. Maybe just as good to some extend, but definitely not as Plextor was in the good old 90's