Agreed, a strength 6 unit at BW could turn out to be very powerful if the AI still uses a lot of Archers for defence. Combine it with the Ziggarut and I think early domination just got that much easier. I'll definately be trying these out after the first game or 2.Last I checked swordsmen required a whole extra technology to research - one that's considerably more expensive than bronze working - before they can be built.
Relative to the vulture, the axemen is a jack-of-all-trades. The vulture is a city taker.
The Holkan looks good too, but the cost might be a bit of a problem that early on.