I've been using a Leupold RX ll for the last 5 years and Swear by it, I shoot a slider sight on my hunting bow, and always take to time to range to my target ( and when that target is a game animal, I really need the time to collect myself, get my eyes of the size of the critter and back on the job of picking a SPOT ) I still can judge distances pretty good, but still pull the trusty range finder, and do find that all of that 'keep busy work ' allows me to make a more carefull shot.