It’s great to be able to soften the quality of a flashgun’s light by bouncing it off the ceiling, but there’s a catch. With the light effectively pointing down from above, areas of the subject can be cast into shadow. In portraiture, for example, you can find that eyes look dull and lifeless because they’re in the shadow of the brow.
All the flashguns on test apart, from the Nikon SB-500, feature a catchlight card, which pulls out from the top of the head. It can work a treat for portraiture or any other time you need to fill in shadows.
Most flashguns feature both a pull-out catchlight card and a flipdown wide-angle diffuser, to help control your scene lighting.