You let the area and situation dictate how high you go. I've purchased many climbers over the years and have had some great experiences using them. Nothing like sneaking into an area early for the first time, finding a hot spot and slowing start climbing and cutting limbs until you've reached your height. I've been as low as 5 foot and as high as 33'-35'. Most people don't even know their height and exaggerate how high they thought they were. You can have a rope to haul stuff up with and that can be your gauge if you know how long it is.
bingo, most people (including myself) are poor judges of distance and height, that is why i started utilizeing a certian lenght of pull up cord, prior to this i may have been climbing 10-12 feet and calling it 15-20
,,when i changed this i started seeing more deer right away
at this point your safety and comfort level should be your primary concern