Great except for the 2.5h wait !

Waited in line for 40 minutes, very slow. The most bizarre thing is, it was my first time in the UK, and they claimed I was on their blacklist and refused to rent me a car. I ended up using my friend's name to rent instead. When returning the car, they pointed out a very small dent and demanded £200. Such minor damages are easy to miss during pickup. After a lengthy argument, they finally dropped the charge. I bet the next person will get scammed too.

The ACE is not the real agency, but Green Motion, this resulted in an internal problem that made me wait more than 3 hours to get the car. I would never again choose this agency because of this, which should even be said before booking.

Car category I booked was not even available at the location. Told by counter staff go and complain to ACE. Given a completely unsatisfactory vehicle instead.

Waited ages to pick up car. Wouldn't accept my credit card for the deposit, but would accept it to pay the 0 excess charges as a result. Car was good though.

Being made to wait so long to pick up the car detracted from any positives like the car being brand new. Not a fan of mileage caps on rental cars so will think twice before using again. Pick up location is not at Heathrow airport.