This is the cheapest of the Nikon Speedlight range. There's no fancy controls. It simply slots in, then you lock it into position and switch on. Even with just 2 AA batteries to power it, it recycles really fast and seems to go on forever. With my Nikon D80, exposure is great. It just works.
Add a Sto-fen diffuser and you'll get the best from it. If you switch from the built in flash to using this speedlight you'll never go back to the cold, harsh illumination that's OK but not quite right.
Use this and you'll spend more time on composing better photos rather than worrying about the light. Recommended.