The process is simple, and you essentially get a 1 week test drive. If the car fails to meet your expectations in the first week you can simply return it. ... ...
You can buy a Vodafone sim card very reasonably in Iceland. That will give local phone # & access as well as data. I used my vodafone every day in Iceland, mainly for maps. Lots easier than buying a GPS with Icelandic maps.
They don't make paper maps in Iceland anymore? Dang.
If we gave two people a digital camera and lens, and after a week we learned one camera has twice as many pixels at the other, who do you think was the better photographer?