A little over 6 months ago we read about the benefits of grinding flaxseed and eating it with cereal, and decided to try it. So we bought the Braun KSM-2 grinder for the purpose, and it worked reasonably well.
However, while staying at a friend's house we tried the same thing with a Krups grinder, and found that
1. it ground the flaxseeds more thoroughly (we think it is because of the oval shape), and
2. it was quieter
We like the Braun's space for winding up the cord, and the Braun seems sturdy enough, so it's not a bad unit. But we bought the Krups and have been using it for a few weeks now, and we prefer it.
Our theory is that the key to the Krups's better grinding is the shape -- seen from above it is an oval with one end chopped off. This shape appears to stop the forward momentum of the flaxseeds (or whatever) so that the blades hit them with more impact. That is, in a circular grinder the seeds tend to pick up speed and swirl around with the blades, but the shape of the Krups doesn't let the speed build up so much.