I'd say that if the suit fits, go for it. I lucked into a couple suits that had been sitting for years for $25 apiece from a local former instructor last fall. The 3mm steamer had only been in the water a couple times (purely a vacation suit), and the other is a thicker (can't tell if it's 5mm or 7mm) John/Jacket that he used for his cert dives in quarries.
The only problem I ran into is that, after getting them home, I realized the John/Jacket doesn't like my ample thighs. It doesn't have much stretch, and I've got a skin on the way to see if that helps me fit into it (and if that doesn't work, Weight Watchers probably will). Stupid mistake on my part, but I was on the way home from work when I picked 'em up, and didn't feel like stripping down on the spot.
Sounds like you've got an opportunity to make sure the suit fits, though, so go for it.
