I don't have the 900 series, but I do have a 400 extreme.

I bought it used and it came with the .019" pins I thought I wanted because my .029" pin covers up too much of my target past 25 yards.
The .019 pins didn't shine very well at all. Granted they also don't have the extra fiber length like the 900 so this may not be an issue.

I ordered one .029" pin for my 20 pin and the purple haze light. This has made the sight much more to my liking.

The purple haze does wonders for the .019 & .029" pins.

I'm not sure about the light blocking your quiver mount- I thought they incorperated this feature further back?

BTW, some people like the lights for nightime hog hunting- not just the dawn & dusk moments.

If you could get your hands on both sized pin sights you'd probably know which you wanted right away. Their .029"ers don't seem as large as my VBG .029" pin does.

Sounds like the light is a $20.00 gamble?