Personally, flash photography is, in my opinion, an experiment in terror. Using "hot lights" is definitely a lot more ... controlled, because the light is continuous, but when you start playing with TTL ... all bets are off for consistency.

The closest thing I can come up with it being similar to is CRAPS.

Others may have a different story to tell ... but, you should plan on using lots of batteries and if you are on the move and changing locations, having your subjects posing several times to get just one shot.