I would not enjoy macro photography without this flash. It provides reliable, even illumination that allows me to stop down enough to get a decent DOF for the subject. It also frees me up from the tripod so I miss far fewer shots.
Cons
I would not enjoy macro photography without this flash; It provides reliable, even illumination that allows me to stop down enough to get a decent DOF for the subject; It also frees me up from the tripod so I miss far fewer shots.