Truth be told the neo cd isn't a reliable system or a desirable one as far as finding software is concerned ( its insanely hard to find the games you would WANT )
However in your case you can make a profit if you try it out don't like it then sell it on ebay. The front loader is a collectors item and can get you $100 at the least alone providing it still works. Metal slug alone will get you $60 and the controller $30 each, at the worse you will definitely break even if you resale. If you buying this to play games its a EXTREMELY bad purchase choice, like I said games are limited yes even on ebay and the games you do find will not be the ones you want and the neo cd system ESPECIALLY the front loader have a high, high break down problem, and since SNK is gone theres no way to get it fixed when it does break, noticed I said does instead of might. How do I know all this I used to own one, bought it new barely played it broke after 3 years. If you want to play neo games get a home system or a Mvs system (recommended)