(Disclaimer: This is my opinion only and it does not represent the opinions of the rest of the VGCollect staff.)
I dunno if that's a good idea.
Not only because they're technically a competitor (heh) but from what little I saw, they don't seem to make much distinction between regional releases or variants. For example, Mario Kart 64 only has the US data, and a Million Seller cover. The NeoGeo platform doesn't have regional sections. And so on. What if you have an Europe or Asia collection? Importing a collection from there could be quite difficult.
They do seem like a good site, but we're much more specialized in some aspects.