Most of mine are between 15 and 20. The tree dictates my height more than anything.
I did notice this past weekend, that I probably need to raise two stands, but they were intentionally hung low to shoot under the leaves. I didn't want to clear every tree in the area for shooting lanes. Once the leaves fall I can raise the stand a couple feet and be out of the line-of-sight.
I'm not particularly fond of being really high, but as long as i'm strapped in I don't even think about it.
I have a 16ft pull retractable pull rope (dog leash) on my climber and I just climb until it's pegged out and it seems to get the job done. I feel the most safe in that stands for some reason...I guess it's because I can fool with the platform until it's "seated" tightly and it's just a solid stand.