The quality looks very good to excellent to me.
I agree that max PIE under 20 is excellent - and your max PIE is only 12.
Your PIF max of 6 is also very good to excellent (this is the most important one), and is directly responsible for the 97% quality score given by CDSpeed. Anything under 16 is considered to be good.
You might consider updating to a later firmware - B7M9 is a little bit old. The latest one is B7T9, although you might want to wait before bothering, since B7U9 is apparently due very soon.
Don't be afraid to do your CDSpeed quality scans at 8X, since this will save you some time. The BenQ is very good at reading the data, and although the scan will deteriorate slightly at 8X, it's probably won't be enough to worry about.
Finally, consider changing your CDSpeed colors from a background of black to a background of white. This is better, since CDSpeed color codes the background color of the PIF region into three colors as follows:
- green = safe
- light red = marginal
- dark red = dangerous
It's easier to see these colors when you set the background to white. You do this by clicking "File->Options" to get to the CDSpeed options dialog box. On the left of this box you will see an item labeled "Disc Quality" - make sure you click on this before proceeding, or you will end up changing the wrong colors. Near the bottom-right you will see a "Colors" section. Switch the "Theme:" from "Legacy" to "Bright" and click OK to dismiss the box.
Do another quality scan and you will be better able to see the colors.