I just cannot believe that everyone likes Jags. Double movement is cool, but the same do horse archers. Jags cannot even hold the city against h.archers. I remind you this Combat1 promo is bound with a trait, not with a unit. I guess, how Jags would look, without this promo.
Siege of a city without walls, without culture with archers non-promoted against Jags would give about 50% odds. That's very satysfinig. The only good thing about them is Woodsman1, which remain after upgrading. However, I would gladly exchange Woodsman2 for Guerilla1, cause AI's like chopping very much.
Personally I found them useful on Tropical world to conquer barbarian cities. And scouting. No more good word about them.
If there Aztecs could build Jags and Swords, but they can't ...
edit: Cabert: What do you build then?