As a small final bonus we offer you the results of a DVD quality check for three devices: BenQ DW1620, Plextor PX-716A, and the near-classic Lite-On SOHW-812S. We won’t give lengthy comments to the results, as this topic will be discussed in more detail in the future. For now you can make your own conclusions. We took discs of two types, DVD+R 16x and DVD+R DL, both manufactured by Mitsubishi Chemical. Here’s what we got:

PI errors/failures for the DVD+R disc burnt by
BenQ DW1620, Lite-On SOHW-812S and Plextor PX-716A at 16x speed
 

Jitter (and Beta for the Plextor drive) for the DVD+R disc burnt by
BenQ DW1620 and Plextor PX-716A at 16x

PI errors/failures for the DVD+R DL disc burnt by
BenQ DW1620, Lite-On SOHW-812S and Plextor PX-716A at 4x
 

Jitter (and Beta for the Plextor drive) for the DVD+R DL disc burnt by
BenQ DW1620 and Plextor PX-716A at 4x

The BenQ DW1620’s main advantage is its ability to estimate the PI error/failure rate and the jitter rate in one pass, while the Plextor takes three passes to do the same. On the other hand, the Plextor can evaluate the asymmetry of the written disc and outputs the info about the number of PO errors – none of the other drives we’ve tested can do that.