Benq dw 1600A recommendable?

Is the Benq DW 1600A recommendable ?

Does it support the following features ?
-read and write full subchannel data ?
-being able to write dual layer dvd (if not, with an firmware upgrade, is there
one already ?)
-does it support Mount Rainier format reading and writing (if not will an
firmware upgrade enable this, is one out already ?)
-does it suport reading and writing dvd-ram ?

cause I am looking to buy an dvd+/-rw that supports either from Benq DW1600a, Nu tech ddw-082, Lite-on sohw 1213s, Lg gsa-4120b or their latest one

read the reviews for the drives you are thinking of buying. you should get all your questions answered by reading the reviews.