The rental company is quite formal. Other than not providing the reserved Nissan car, everything was fine, and they didn't push hard on insurance sales. The car return process at 5 AM was also very smooth.

The Mexican staff member at MAS Car Rental was terrible. She made things difficult just because I'm Asian. First, the shuttle bus stop was hard to find; remember to look for the sign above with 03 after you exit. This might have been my own mistake, so future customers should take note. Then, from the time I showed my booking confirmation to when I finally got the car, she created all possible difficulties. She tried to make me buy full insurance even though I already had it. She wanted proof of third-party liability insurance, which I found out from the rental company's customer service was something they should provide and I don’t need to buy. She claimed my documents were only in Chinese and not in Spanish (which was a lie), so I had to send her the confirmation email on the spot. She said she wouldn't accept my credit card because it was opened in January, and they only accept cards open for more than a year (customer service confirmed this was a lie too). She then took at least 20 minutes to read my bilingual booking and wouldn't let me talk to customer service (thinking I was recording her). Finally, only after I got really angry did she complete the credit card process. Can you imagine it took 1.2 hours? I've driven in over ten countries and didn't expect the worst service to be in Mexico. Future customers should be aware. PS: No problems with police and driving around the Yucatán Peninsula was very easy.

They added insurance without consulting us, but they eventually removed it at our insistence. Everything else was satisfactory.

Waited over an hour. Refused our insurance so had to pay £150 or not be allowed to take the car

Be very careful of their tricks to sell you upgrades. They said they would fill in full tank of gas for a cheaper rate than outside fuel stations, they said that fuel level is very low and they suggest taking the initial full tank fuel package. I declined this package, when I get to the car I rented, the fuel is already at full level.