1. Forced insurance purchase

2. Additional toll fees

These two issues caused the actual price to increase significantly.

The store explained that Colorado state law requires additional insurance.

Also, extra toll fees were added, with two options: $15 per day or $10 per day for actual toll charges.
Due to the time it would have taken to contact the rental car company, I had to reluctantly accept these charges.
Waited about half an hour to pick up the car.

I personally use this car rental company both in Germany and the USA. The service quality is top-notch, with no additional sales or imposed services. The car return and inspection process is fast and efficient. The cars are new and in good condition, with full fuel tanks.

Like: Costs, promptness
Dislike: All of the rental cars in the fleet (Intermediate) were pretty badly scratched up and dinged but there was no inspection of the car before we left. We had to point that out to the security person at the gate before we went the lot, to make sure that we wouldn't be blamed later.

Like: The rental agents were all friendly, helpful, and the price for our rental was excellent.
Dislike: The car was just ok. I had never driven a Nissan Sentra and was disappointed with the performance. I picked the car, so that is on me. The interior of the car was not very clean.

Like: Used Thrifty cars. Had no issues in communication. They were ready for me when I showed up and all my information was already input.