Because you are buying it second hand it might not even be an issue -- but it's been my experience with that series of figures that the costume can be a real bitch to get on. The little white muscle pieces fit on to the figure body with double sided sticky tape (included) but come off while you're trying to put the body suit on. At the same time, the outside armor pieces are put on my similar means as the inside pieces, so they -can- come off if you're not careful.
Generally once put together, they are really nice looking if not maybe -quite- as good quality as the medicom versions.
On the upside they are SIC scale so they won't look totally out of place size wise, if you have some SIC figs.