The American model SNES unit is very different in size and color from its European and Japanese counterparts. Its games are made differently as well. There's one flaw; the Europen and Japanese game carts cannot fit onto the unit.
The European and Japanese SNES/SFC carts are missing 2 holes which are present on American SNES carts. The holes are filled into place when a US SNES cart is inserted into its unit. The import carts would have extreme difficulty, and therefore cannot fit into a US unit.
In order to play import SNES games on a US SNES system, you'll need to cut 2 strips inside the SNES unit with pliers.
Once this is done, you can finally play your most anticipated SNES imports! Rejoice!
Of course, if you have one of these your day is already prepared, but who wants to go through the pain of eBay?