The reason I like the Fire-Control rest, has been mentioned already. The speed you can re-aquire your target is cut in more than half. Which helps if you are shooting in a condition. I don't like dinking around with knobs, wheels wasting my time while the wind is changing. When I can move the crosshair with the tug or push of the joystick. It has 60 minutes of adjustment.
$200 bucks is really a bargain compared to the next step up a SEB or Farley at $800+, and Sam posted a link even cheaper.
I used this thing longrange rockchuck hunting one day. I settled my sights on a rockchuck colonie. I could pan from one rockchuck to another at 1000 yards.
If you want fast, a joystick is hard to beat.
