you should look at the steddipod. very versatile. don't get anything that does not have a pivot head, when you are up that high, it really helps. it is more expensive, but it seems to to a lot more.
you can get bored really quick with just a high angle. believe me..I am bored with it, though it is a good angle to have. if you practice a lot with the steddipod, you can more interesting shots, just by using your knees, waist..etc. fully body stuff. I can't really describe it...
Wow, that looks scary to me. I can just see the camera crashing down, and kicking myself forever for not thinking first. Maybe if their was like a spike on the bottom to plant it in the ground, and a hand strap... but thers no way I'd use that with people around that could bump into you. Looks pretty top heavy.