Very good, but not without issues.

Even though this game came out a few years ago, it still is updated with new content, which I personally really enjoy. The in-app purchases are even worth buying, since they too get more content in updates. As for the functionality, the game runs quite well, never crashing or lagging. The only real issues are that some of the item models render very bright and/or slightly misaligned. I would like to see more animations and sounds added to the game eventually.

CampbellHomer about Gun Building 3, v3.42