I've been spotted at 20 feet and had deer walk right under me in a 12 foot ladder. It just depends on how well you disguise yourself I think. My 12 foot ladder stand is lower than I like to be honestly, but I conceal myself very well with some branches I cut and I'd be willing to bet a lot of money that I won't be busted from that stand all season. I always feel very well hidden in that stand. However, if you are just using the natural cover already provided I would definitely recommend going higher. Don't see much need in going too far over 20' though.