Avoid them. Even if you clearly tell them you don't want any additional insurance - in my case I was already fully covered, they will sneek in and quickly shove a 6-page contract in front of you. When you get home, and your deposit is not refunded, that's when you get the surprise that actually what you initially (when you were exasperated after waiting for over an hour) was the most expensive car rental in history. I took the cheapest car and had full coverage. This was the most expensive car rental I've had and I am extremely well-travelled. Bunch of crooks. BEWARE!