I have several now. I would have to say that if you don't enjoy running down old circuit boards and looking for cracked solder joints, testing dry rotted caps, adjusting the output on 25 year old power supplies etc., you may want to buy one of the new "old" machines. Several companies now make the same old games but the games now run on new electronics. I've spent hours inside my 1981 Galaga game, 1983 Super Mario Bros. game, my Centipede game, my Mrs. Pacman game etc. troubleshooting. They are all working fine now, but I don't dare leave them plugged in during a thunderstorm. I gave up and installed new switching power supplies in the Super Mario and Galaga. That hurts their true collectable value, but at least they work. Besides, they all have been worked on several times by now. Was there a good tech who worked on them, or some schmuck who just wanted to work long enough to get it out his door?
Maybe others have had different results. I have the ability to fix the old games, I just am running out of the desire to do so constantly.