they liaise with a few car rentals to provide you the car rental service. they themselves do not have a fleet of cars for rent. you might be able to get a cheaper rate (not sure) if you go direct to the car rental companies. As stated on their website they partner with mayflower and PRAC (Located at midvalley)
perhaps you google for their website and compare the prices.
Travel Car/Van/Motobike/bus Rental, Anywhere in Malaysia