I have used VroomVroomVroom several times in Australia over the past few years and always had a great experience. The rates you get are great and much lower than what you would get when trying to rent directly through the car rental company. I have tried to campare and there is no doubt.
In connnection with my latest car rental I had a problem with Hertz not willing to accept the rates that I had booked for. But VroomVroomVroom helped me out taking up the case very professionally - ensuring that I got what VroomVroomVroom promised in the booking I had made.
Based on my own experience, I warmly recommend VroomVroomVroom and will stay as a loyal customer myself.