I'm just a little over 6'5" and have pretty well settled on 60" cues. I tried a 62" for a while, but I ended up playing with a longer bridge length and that seemed to hurt accuracy for me. I think if I could have adjusted the balance point it may have worked out better and made me move the cue back in my hand instead of the extra length being all in the front. It just felt odd to me to move my grip hand up.
I've always tended to favor a front heavy cue. One thing to consider is if you are playing with most production cues that have a big weight bolt in the very back of the cue, it's going to feel very different with an extension on it compared to custom cue that is more naturally weighted on the front end, or a cue that has a steel joint with a big pin etc. A cue with the weight in the rear would probably feel better with a mid-extension.
I'm not willing to spend the money just to try it, but I would really like to have a week to mess around with something like a McDermott H-Series just to experiment with moving the weight and then adding/removing extensions.
Ok for big tables, but on a bar box, I'd probably start poking holes thru nearby walls.
