I already bought insurance on the platform, but the store made me buy it again when I signed the paperwork. It was unavoidable.

They aggressively pushed their insurance. I informed them that I had already purchased extra full coverage, but the agent kept insisting that their company's insurance was necessary, claiming other insurances were not recognized. When I firmly declined, they told me that since my booking price through the rental platform was lower, they would need to freeze an extra 1000 euros (normal customers have 250 euros frozen, but I would have 1250 euros). They said I could either pay extra for their insurance or top up the rental price to match their company's rate. Very frustrating!!! Additionally, the parking fees for the vehicles at the airport are passed on to the renters, which is extremely unreasonable!!!

They set consumer traps and deceive customers!

It was okay. When asked, confirmed not to get insurance, but it was on the paper.

Avis Belgrade, is pretty slow in service. Though pickup didn't bothered me much, drop off took almost 2hrs. Luckily I had time in my hand or else I would have missed my flight. There was a minor scratch on the car for which they charged me almost 400 euros. Bad part is the charge was mentioned on the invoice as insurance premium. Thanks ERC, they managed to convince Insurer about the genuineness of the charges.

Price drop protector is a great option. It saved me 10% as ERC auto booked me with lower price. ERC was also very co-operative in helping me on insurance claim. I have purchased additional coverage from them which took care of access charged by Avis.