What kind of PSE did you get? I bought a new PSE madness right in the middle of deer season and killed two deer with it the first week I had it and i've already done two robin hoods with it. Its a great shooting bow. Most PSE's are.

As far as rangefinders... I didn't get one until I got my new pse. Before I just had a smaller bow that was limited on shooting distance and my max shot was probably 25-30 yards so its a little easier to guess when your out hunting. But with this new pse I can shoot 45-50 yards easily if I wanted to and really needed to so I got a range finder. Both deer that I got I used the range finder on and both were dead on perfect heart and double lung shots. One shot was at 35 yards and the other at 42.