I have a Burris FFII 3-9x40 ballist plex, and while it gives you holdovers, it doesn't have tactical knobs like the Bushnell tactical. The tactical knobs may be an unwanted protuberance in the bush, but they allow precise adjustment for elevation and windage that would wouldn't otherwise have. With the use of ballistic software, and or your own testing, you can build a chart of holdovers at desired incriments over the range of distance you intend to shoot. On my 22, that's pretty much every 25 yards you want an adjustment if you are going to be right on from say 25-200 yards.