I've seen this brand of map all over Europe (it's from a German company so you know it must be comprehensive) so when I was looking for a solid map to use while driving around Iceland for a week I decided to pick this one. I was not disappointed at all! The map is very big, but because it's so big there is a lot of detail. The kilometers are printed both for short and long distances which is very helpful for estimating travel times.
Another thing that saved us many times was that the gas stations are marked on the map. Most small towns have gas stations, at least where we were (south, west, and northwest), but it was conforting to be able to look on the map and see how far we had to go to get to the next gas station. And the map seemed up to date. We had no problems finding roads, camp grounds, landmarks, gas stations, etc that were listed on the map.
We had a GPS unit in our car but my friend and I both prefer looking at a physical map and didn't look at the GPS once because we didn't need it, so if you plan on using this map as your primary travel resource or even just as a GPS backup, I would highly recommend it!!!