I too prefer the ultra models. I am currently shooting the DS-XL5519. I like the XL(2") sight housingfor hunting for the wider field of view and light to your eye. And the "rheostat" feature is very nice because you can dim or brighten the fiber as the ambient light dictates. The dial adjusteris soooo much easier to use and see than the typical sliding bar. Once attached to your bow it is completely toolless in adjustments and the micro widage is vry precise (1 click = 1/8" at 20 yards)

http://www.hhasports.com/sights/opt_lite_ultra.htm