I've finally finished a fieldable Iberian warband that seemed to be taking ages. They seem fun to play. They don't have a lot of hitting power but their unique guerrilla mechanic moves them in your opponent's turn, and makes them pretty tricky.
This is all I can field at the moment, but I have 8 more warriors, 8 more slinger warriors, and 12 more levy javelins in the pipeline to make them a bit more flexible.
I played them against my Romans and they were pretty good, although I was trying out a new extreme Roman formation of 8 units of 6 warriors and a Tribune, which made them very fragile.