Playing a game as the Greeks, tried out the torsion catapult. It can now keep up with the infantry which is great compared to EB1. Doesn't seem worth it really though still. It's very inaccurate, to the point where even if you target concentrations it's still likely to miss, and has a slow rof (which makes sense, but just from the point of view whether in-game they are useful). Range is good but not so good that you can put them safely way behind the lines. Slingers tend to target them, and the range gets close if you're attacking a hill. KH can only recruit them in two cities so forget about retraining or reinforcing. Getting an enemy to abandon a high point seems to be one of the intuitive uses for them, but if you can't do it safely that's gone. As for assaulting cities, I guess it's mildly useful to save you a turn assaulting a poorly-defended city. If it's heavily defended, you'll be building siege equipment anyway or more likely just maintaining the siege.
Anyone use them often and have some favorite tactics?