Got everything from 6'up in anapple tree, a 10' highplatform, a 15' ladderstand, a 20' platform, to a 35' platform.

The 6' is just a tie-on seat in a dense apple tree. Really nothing more than a blind on the edge of a swampy area.
The 10' is my "regular" stand, set on the edge of a ridge and overlooking a gully. Any higher and I'd only see treetops in 3 directions.
The 15' goes where it needs to, depending on weather.
The 20' is in mature, opentimber and overlooks a brushy area.
The 35' is in old timber and overlooks a field, brush field, creek, etc. and anything less than 25' would leave about a 50yard range of sight. (yes, it is a rifle oply stand. depending on direction, you can see up to 450+/- yards)