Finally got around to getting keyed alike locks for all my games and it was well worth it. I picked up a dozen locks from PBL (so I have a couple of spares), and it's great not to have to manage 9 sets of keys anymore. It means that it's much faster to open up a machine to check something while I'm playing, since I have the master key on my keychain now, and don't have to go find the right keys for a particular game. It also means that I now have 23 spare keys in case I lose one (or one of the kids loses it). I can see how it'd be more expensive with a whole bunch of games, but even at a few bucks each, it's cheaper than a lot of single game mods out there, and really nice to have. It also means you don't have to leave keys in the machines all the time, which I've seen cause problems more than once by getting pushed in all the way, turning due to gravity, coin door opens, and kills the flippers (usually at the worst possible time). Anyway, highly recommended mod-I should have done this ages ago.