I regularly use drybrushing on my 25mm Fantasy Figures - I find it particularly good when trying to give a Animal skins, fur detail - I have also found it great for helping some of the more fiddly details to stand out from the background of the model, such as chainmail, bolts etc.
I used this technique on my first model and he turned out pretty damn good - won 3rd in my local model club comp.
Cheers
LoriJ