MGOW is my favorite of the Sys 80 games. I've owned Haunted House, BH, and MGOW (a couple times). Read some of the reviews. I wrote one a while back. Next to F14, MGOW was probably the best "one more game" pin that I've had. Pretty challenging stuff.
https://pinside.com/pinball/archive/mars-god-of-war/ratings
It's not like a modern B/W or Stern game, or a Sys 11 for that matter. It's an early SS game and designed to eat your quarters (like most of the Gottliebs). Keep that in mine. If you can and you're still interested I'd say go for it if the price is right.