Maybe its the bit of adrenaline junkie in me, but I'd do it. Up, at least. Down, I'm not so sure of.
Not to mention dragging that 30 LB bag of stuff up with you. 30 LBs could easily get caught up in something, start shifting your center of balance, or all sorts of nasty things.
I remember a class trip to Toronto and going up in the CN tower. Everyone else was freaking out, but there were a few of us that thought it was cool. Went all the way to the top. It was a bit freaky, but not bad. Stood out over the top observation deck looking across the lake at Buffalo when it was at night.
I don't see it being too bad, if you dont have other buildings and landmarks around you to remind you that you are that high up.