Longevity for me is very much linked to difficulty. I own several 90 titles and the most played after several years is The Shadow. I understand who sold it after two weeks, because for me too the beginning was not so good. It looked very clunky and random. Its really difficult to master, all shots require to be very precise. But when you become VERY good is the closest machine to a real sport. Actually, like in a real sport, if you are not really on the ball, your performance badly drops even after many years playing it. But not like in a kind of random way like Flash Gordon, for example. As a comparison, I own Wh2O, and although fun and with good variety is much easier than TS, and in the long run it gets played less (but way more popular among casual quite good players). Also, the TS rules, when tweaked properly (see https://pinside.com/pinball/forum/topic/the-shadow-luppin-rules ), offer endless opportunities for experimentation and many different approaches to the game (and much better rewarding scorewise than the Bowen tutorial).