as for using the machine.. it was recommended to me by the bow shop.. he said the best way to tune your bow it to eliminate all human error thus insuring that your bow is as tuned as it could ever be.. and in part i think hes correct..
Well, you keep tuning with a machine then hunting with out one and you will always have an untuned bow so long as you are shooting the bow and not the machine. The machine isn't shooting the bow.... You are. You need to tune the bow with you shooting it, not a machine shooing it, not the pro shop manager shooting it, not your buddy down the street that is a self proclaimed expert shooting it... You and only you.