Dave.....
The fact that you were dragging a bow didn't clue you in?
Aaron.....I've hunted from 15' and I've hunted from 25'. I can tell you that "I" would be trimming some underbrush. 30' is getting too high for my shot angle preference. I'm not so concerned about your safety...if you're staying tied off (

) the entire time......but I can attest to some steep angles and it not being "ideal".
"IF" you're looking at ducking inside a field edge.....and you think your shot opportunity is going to be in the 18+ yd range.....I might consider it. For "normal" hunting situations, though.....I just think you're asking for trouble (with the angles, only).
My .02.....just be safe.