It was the unit size and replacement hassle that led me to not use them. You definitely do not want to be using the Temple of Api on full-grown Greek or Roman (or should I say ex-Greek or Roman) cities for the population/squalor headaches.

Sooooo, they had a looong way to go back to the "wild" country to get refit, and hence out of action for the time it took to transit there and back. I had to resort to carrying replacements in a fleet set off-shore to reduce turnover time, and of course that's nothing but a magnet for enemy fleets to show up for. Meanwhile, Noble Archers can be refit just about anyplace that has an advanced enough stables. That was enough to convince me they weren't worth the hassle.