I rented a car in Tbilisi Airport. The car was new (year 2018 and <20k km).
I also rented an overpriced GPS (unsurprisingly) that kept on taking us through unpaved roads.
I ended up with a scratch on the car - most likely due to all the stones flying around on Georgian unpaved roads.
I was supposed to be insured at 85% under the condition that "I had to call them when the car was damaged". As I discovered the scratch only when dropping off the car there was no way I could've called them beforehand.
Manager at Naniko said she didn't care and that "it was not her problem".
They took 100 USD directly out of my deposit for a scratch they will most likely never actually repair.
It feels like a rip-off. I strongly recommend against using their service.