I hunt almost exclusively from a 15' version of the Hunter's View Buddy stand. It has a shooting rail over which I place camo fabric. Here is a picture of one of them:
I have 5 of those buddy stands on the property.
Deer will occasionally look up, but they seldom show recognition.
Occasionally I'll get busted from scent, but I doubt the height of the stand is to blame for that. This usually happens on the stands that are on hillsides. A difference of 5,10,or 15 feet will not save you if the wind is blowing right, and the deer come on the up-hill side of the stand and you're practically eye- level to them.