it's actually pretty heavy, so it does become difficult after a while. the guy who is being pyramid head lifts weights regularly though, so it shouldn't be as hard on him as it would for me.
just to give you an idea of the scale, the walls are about 8" tall which puts the top apex of the pyramid at 7'6"... so he's pretty tall.
As for the pyramid, lots of people say "that's not scary" and stuff..
I don't really look at pyramid head as scary.. until I saw what he does int he game and in the movie. he is quite the relentless killer. that aside, I saw pictures of him before I played the game, and I wasn't thinking "that's not scary".. what drew me to it was it was really really bizzar and strange.. which is really interesting to me. and after getting into it for a while, it just kinda grew on me.