String loops are good, but not neccesary. It really depends on you and what you want and are comfortable with. If you do a tremendous amount of shooting, a string loop would be a good idea...you don' t have to worry about the wear on your string. As far as draw length, it doesn' t change your draw length at all...just your percieved draw length. Like Rack said, your release anchor will be a little different. Most guys I know tie their loops as short as possible, and then shorten their release if they feel they need to. I personally don' t shoot a loop right now, and have no problems at all. Like I said, it' s up to you.