There was more info here, but the OP deleted all his old posts to try and conceal what as a$$hole he his, Roy Vegas style.
The Changer is a consumer version of Capcom's CPS arcade system, much in the same way that SNK made a home version of the arcade Neo Geo system. Obviously a Neo Geo is about a million times more fun since SNK released AES carts just a month or three after the MVS came out. SNK also used the same arcade hardware for 14 years or so, so the library is much bigger, better, badder.
A CP Changer that played CPS2 games would have been MUCH better. Capcom totally kicked ass during the CPS2 era. The versus games, the alpha games, Pro Gear, Puzzle Fighter, Vampire, AvP, Pocket Fighter, D&D, Mars Matrix....such good shit.
In the end though since super guns exists it much better and cheaper to just play the actual arcade boards. You can get almost any CPS1 or 2 game for $100 or less, if not a third of that. No need for a (semi) proprietary system. The cart self destruction is also somewhat easily solved nowadays.