The answer has to be yes, othewise they would have gone out of business
some time ago. Generally speaking, cheap car-hire websites are the
websites of car hire agents, not of the car-hire companies themselves.
The agents, like travel agents, sell car-hire services from the
car-hire companies. Because they are doing a lot of business, they can
negotiate special discounted rates, that induvidual travellers cannot
For instance, if
choose a car from Rentalcars or Argus, you may actually get your car
but you'll get it cheaper than you could by renting it
Alternatively, your car may be supplied by a
local car-hire company that has lower rates, perhaps because they use
cars that are not quite so new.
Depending on who you actually get the car from,
you may pick it up directly at the airport or train station, or may
have to call the local representative, who will come and collect you at
the airport or station, and drive you to a pick-up location
If you're in a massive hurry, on a business trip, or money's
object, then it's often just a bit easier to use a car hire firm like Hertz
generally speaking the low-cost agents are just as reliable, and, as
mentioned above, you may actually pick up your car from Hertz
anyway.... but you won't know that until you've confirmed your booking.