Knowing how useless normal ballistae are I avoided buying the mobile variety for some time. Having now used them I believe they are the saving of the western Empire. Just one of them, accompanied by a General, can dispose of most rebels and quickly earn experience points for itself and the General, especially as the odds are always heavily against the Romans numerically.
They are effectively invulnerable as long as you keep them well away from archers and light cavalry, or charge such units down first with the General. I've also found they provide an unpleasant surprise of besieging armies.
No doubt they are another of RTW's anachronisms, but they're great fun and very useful. I recommend them to any discerning Roman Emperors!
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