Coupled with my Olympus E420, this is the best flash I have owned since my first Olympus camera + flash in 1977. To put it simply, it will handle any need for a flash-gun that an amateur photographer will encounter. You could add more power with its sister, the FL-50, but that's a choice you will make for yourself.
Using it with an Olympus E-series is simplicity itself, and, as long as you have made the right choices, like not forgetting the red-eye reduction, it will give you the right results. The build quality is exceptionally good.
Now I've been using it, a lot, I have to concede that the FL-36 is a whole lot better than my first Olympus flash. I thought the auto-zoom function would be less efficient than the rest. WRONG! It's absolutely brilliant! It's the degree of integration to my Olympus E420 that does it. Absolutely effective. (It's an E-system product, so it will do the same on any Olympus E-system camera.)
I've succeeded macro shots of shiny objects, bouncing the light off a wall or the ceiling, I've taken portraits indoors and out. Whatever genuine photographic test I've put it to, it has just sailed through.