There are few tanks I fear more in tight terrain than the Ontos. Paired with a Demolisher, the two will obliterate virtually anything in short order. 8-10 medium lasers can lay down disgusting damage against easy targets, nearly guarantee a couple of hits against hard ones, and tear apart other tanks like a can opener. With infantry spotting for indirect LRM fire, they are one of the best urban defense vehicles in the game. Like any slow tank with short-range guns, however, they don't belong anywhere that an enemy can get loss on them from further than 6 hexes out.