Picked up car at Denver Airport, brand new Nissan with only 6500 km, drove to the hotel, few days of

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.

Very convenient. There is a shuttle at the airport. No promotional pitches when picking up the car. Clear signage for returns. The return process was quick and smooth without any issues. Everything was perfect.

Manual negative review

Thrift gave us a free upgrade to a mid-size SUV. It was very appreciated when it started snowing in Denver

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.