I have been using one since they came out and i love this sight.
I actually set mine for 20yrds on the ground and it will hit dead on at 30yrds, (15-30 ft. in a tree). I had my wife with me so she could retrieve arrows while i was experimenting with shot angle and almost straight down was not a problem. Just get out and find a nice tree at a comfortable height for you and see what you can and can't do with it. Once again it is a really well built sight and extremely tough. Good Luck,
YUKONBILL