Oct 2013, flawless experience with Vamos car rental, renting for 7 days to drive from San Jose to the Pacic Coast at Playa Dewl Cocos - about 4 hours one way on major roads. Not only was Vamos the least expensive I could find by a large amount, their extras were free or also much cheaper than other car rentals - for example, free emergency phone which you could add unlimited Costa Rica calls to for $7/day, free Costa Rica GPS with English option that worked great and made this my first trip to C.R. much better and smoother. The agent we worked with help input my 2 destinations in the GPS to show me how it worked, but that was really not needed - it was a nice Garmin very similar to the model I use at home in the U.S. - theirs was actually a little better than mine.
I made my reservation on-line several weeks ahead and recommend you do the same. Vamos was also very responsive by email to any and all questions I had and I emailed them 3 times with fast clear responses each time.
In San Jose less than a mile from the airport, as they stated - ah agent was there to pick us up and drive us to their office and on our return they were sensitive to any urgency and providing a fast trip back to the airport - but we were early so there was no rush.
The cost in U.S. dollars was exactly as agreed upon.
The rental did take a little while, partly because I was a little nervous about driving there and had some special questions and requests. Vamos made me feel more comfortable and was able to answer all my questions and get me off to a good start.
It turned out that driving there was much easier than I expected, Vamos helped make it easier, and other than a slow tire leak caused by a faulty valve stem that we had replaced while at Playas Del Coco renting and driving was no problem and a big addition to my C.R. trip. Do heed the adive though - read up about C.R. roads and signs and drive very defensively - Ticos are fairly aggressive drivers.