I would like to know about peoples experiences (if any) with the cue extensions that are out there and are made to go in the middle of the cue. I don't know if they have an actual name or what they are called, but I am seeing more and more of them. I would think that they must affect the cues hit since they connect at the joint and are not (usually) made by the original cuemaker. Also, don't they have a big effect on the balance of the cue? I am curious if anyone has any experience with these. Please comment if you have. Thanks.