I booked a car with Masterkings via Zest. The car and guys at Faro are fine, but if someone hits your car, don't expect any help from them. Zest just say call the police, and the Masterkings helpline wasn't much better. If it wasn't for a our Portuguese speaking villa rep, we would have been stranded. Furthermore, despite taking out the full insurance with no excess payable, Masterkings still insisted on taking my 450 euro security deposit before replacing the car. It took over 8 weeks of constant emails to get a refund.