Close to 15 years collecting for me , i still have the Bally Supersonic i bought back then plus about 6 other machines at the moment.

That wasn't the first machine i owned though , my parents bought me a Gottlieb Sure Shot back when i was 14 (so 31 years ago)
It was only a few years old and in mint condition.....they paid $275 for it , i know because i still have the receipt.....wish i still had the machine , i sold it for $50