Rob, check out this on the rusting screws :S (stolen from a RC thread, sorry the pic is HUGE)
Seems like a good skimmer though, not sure if they fixed that issue, searching for the skimmer brought up great reviews, searching for the pump brought up some problems.
I'm a big supporter of buying used stuff, lots of people upgrade leaving good stuff behind, I got my skimmer for dirt cheap, and it works great.