The ease of use, easy payment process (we have no credit card issues here) and also their customer support is awesome! Nothing at all so far - we are very happy with this solution for our car park business needs. We did not face any challenges while using premiumparking as it was working seamlessly without interruptions in its functioning or downtime even once during last one year that I know about. It's great to be able to manage your revenue from each client/customer easily through dashboard interface.