Lee: The V-zone is the best xbow scope out there, followed by Htoler's beloved !0 pt. There are advantages and disadvantages for both. If a person uses one xbow and one arrow, and the combo is within the Proviews preset reticules, the lit centers in two colors may be the answer. They have 3 ranges, which you can pick your choice from. I'm guessing here, since I don't use the Proview, but would think one would use the middle crosshair at 30 and then see where the 20 and 40 hit. The V-zone on the other hand is right on the money at 10-50. It does not matter what fps you're getting, once you sight it in at 20, you just turn the "speed" ring up or down until your poi is on at 30. You do not want to use the adjustments under the caps after your 20 yd sight-in. Actually, it is a 2x-4x variable power scope, except where the normal rifle type scopes have the ring graduated in magnifications, the V-zone has them in fps. If you hit low at 30, turn the ring down to lower fps, opposite if you are high. The triangles on verticle hair never really move, all is accomplished by changing the field of view. I've toyed w/ several range compensating rifle scopes over the years, and this is the first that really does what they claim. Ironically, I was on a hog hunt in Texas a few months back, and had a shot at a bobcat at 30 yds, but could not see my 30 yd triangle in V-zone due to supplied light bewing too weak. Would have been a perfect time to have the Proview w/ lit reticule. Can't win them all!!! LOL