I've always rented from HERTZ, and generally, there are no issues. I've encountered both enthusiastic and average staff, and I've never had to wait in line.

The staff added a GPS fee without saying a word! 147 euros! Zuzuche offers free GPS, which we didn't even request. Who needs their GPS? It's simply a scam!

The service was great, but we didn't know in advance that luxury cars couldn't be taken to certain countries, so we had to change the car last minute.

Everything was very convenient and fast, but there was an additional charge of 50 euros for an extra driver.

Booked an automatic BMW sedan for 400+ euros, they insisted it was unavailable and gave me a terrible Ford car, a manual without navigation. Then they offered a tiny Citroen automatic also without navigation. I had no choice but to switch to a Mercedes C180 which cost an additional 30 euros per day. After ten days, they charged another 100+ euros saying it was tax. In the end, I spent over 800 euros. What a rip-off!