I like them. For serious cross-country VFR flying in Europe it's great to have a common format, and I find that they have all of the relevant FIS and ATC frequencies right there. They have enough topographic data to verify position, but not too much to clutter the airspace data, which I am much more interested in as you can always verify position using radio aids anyway. Also I agree with Genghis that the format is handy for the kneepad.