This adds tiers of spidertrons that have increased equipment grids, health, shooting speed and range, etc. The research and recipe for each tier spidertron increases exponentially (by a factor by 3, starting at 10,000 units for Mk 2) and the benefits stack up slowly, which I think makes it pretty fair. Currently it only goes up to Mk 10, but the code is generic and increasing the max tier is as simple as changing a single number, so if you've reached Mk 10 and you want it to go further then just let me know