What problems to look out for with Benq 1640?

Hey all
Just got my Benq DW1640. Unfortunately it's a made in China and is July 2005 original firmware BSHB. Hopefully it will be okay but can any confirm what problems I should look out for?
1) Not able to read at highspeed with clean media with latest normal firmware, speed drops during read a lot etc
2) Quality scans with high quality media are consistently poor
3) Not able to read at maximum speed with riplock free firmware (MCSE) with clean media
Just got my Benq DW1640. Unfortunately it's a made in China and is July 2005 original firmware BSHB. Hopefully it will be okay but can any confirm what problems I should look out for?
1) Not able to read at highspeed with clean media with latest normal firmware, speed drops during read a lot etc
2) Quality scans with high quality media are consistently poor
3) Not able to read at maximum speed with riplock free firmware (MCSE) with clean media