we used it last august, and it was fantastic. our driver was waitingfor us at baggage, and he helped us load everything. 4 adult bags fit in the trunk. 4 adults and 1 driver fit very comfortably in the car (towncar), and the driver had the AC blarin' so it was nice and cool. he was very kind, though his english was a bit off (Croatian), but did his best to chat with us.
I highly recommend quicksliver.