I would recommend buying a George Forman instead of a sandwich maker. I find the sandwich maker squashes the sandwiches and all the cheese is pushed out, then it gets stuck to the trays of the sandwich maker.
This happens a bit with the GF sometimes but I find it's not as much and it's also much easier to clean.
Then again, I have a very old Morphy Richards Sandwich maker, maybe sandwich making technology has improved since then!