Dunno if you're still watching this thread, but using it indoors in indirect bounce flash mode is amazing. No harsh shadows, unless you're a couple of feet away from the subject you wouldn't even know a flash had been used.
Just bear in mind that in Av or Tv mode the camera meters for ambient light, rather than the output of the flash. It's as if you are taking the shot without the flash. I ended up using M mode since P likes to leave the lens wide open when there isn't much light... there's very little DOF available at f2.5 or f2.8! (Another gotcha, M mode also meters for ambient so the light meter is useless. You just have to experiment to get the correct exposure.)
I've also used it for fill flash in outdoor daylight shots. Again, very natural looking, and it really brings out some features.
