I have to agree with mobow, you will never go back. I bought a HHA Pro and absolutly love it, it was pricey, but well worth it. As far as time to adjust the sight when a deer comes in, ithink you will have more than enough time, it only takes half a second. in my experiance, most of my shots are within 20 yds.any thing farther out usallywill have that extra time to adjust if youhave to.I self film all of my hunts so not only do i have to get my bow off the hook, check distances in acordance with the deers travel route, adjust my sight if need be, but i also have to get my camera pointed in the right direction and focused, and then get my release on my string when the deer comes into picture. I don't want to hear there wont be enough time to adjust. It can and has been done with practice and experiance.