I just went through the same thing. You wouldn't think it would be so hard to find a good DL drive that works for you, but you couldn't prove it by me. Go to the LG forum and read my post titled: Bought 4166B today - I'm very pleased
This was my fourth drive in a week. I couldn't find one that worked well for me on Verbatim media. I tried the Benq 1640 (which is suppose to be the the holy grail of DL drives), the Benq 1650, and the Liteon 1635S. All these drives are suppose to be excellent, and maybe they are. They just didn't work for me. I ended up (after reading several excellent comments) with the LG 4166B and am finally pleased.
You too may want to look at this drive. I hope you don't have to try as many as me to find the right one.