Rented a car from them for a month, with cellphone and GPS. Would never use again. Specifically:
--The car rattled and shook quite a bit, especially when the A/C was on, so much so that people hearing it approach were commenting on it. The transfer case shifter rattled annoyingly if you didn't set your hand on the shifter to dampen the noise.
--After a week, the car would no longer switch out of 4-hi.
--Bald tires resulted in two flat tires. The jack was missing a part (jack saddle), so I had to borrow a jack to change the tire. I went to get the tire patched, and they said that it had been patched so many times that I would need a new tire. With repeated prodding, Dean covered the cost of the new tire and jack. Bald tires are not fun on muddy Costa Rican roads!
--The cellphone that I rented with the car did not work. After translating the Spanish error messages we were getting, it seemed as if the phone had been suspended. I called Dean's service guy, who let us know that "Dean didn't pay the bill"! They first agreed to only refund the cost of renting the phone for the two weeks in which we were wrestling with it, then ultimately refunded the whole cost.
--Dean's email response time plummeted once he had our initial payment. I had to repeatedly email and call before he would get back in touch with me.
Even though the cost of the new tire/jack and non-working cell phone fees were refunded, it just wasn't worth the stress of dealing with it on vacation, and wondering when Dean would decide to get back to me, or if any of the numerous noises that the vehicle was making were something to worry about. Next time, we'll just go with one of the mainstream car rental places, check the tread of all the tires, and photograph/videotape the car thoroughly before renting.
The irony is that this company sells itself on the fact that it's American-run, and free of the common Costa Rica rental scams.