I just built all my Grimms over the weekend. If you include Grimmsham, Tiny and the 5 grimminions there are a total of 20 Grimms. That's a LOT, they are easily the biggest faction...around double the size of all the others.
On the downside, one of Grimmsham's rules that lets you take duplicates of a grimm is sort of pointless. Personally I don't want to buy multiples of a figure, despite how useful it might be in-game. However that's just my opinion. I am looking forward to painting them all. Some really great little figures in that batch.