We pre-paid for our LCAR (got a BWM 328i from California), with a child seat (Group 0/1).
The employee brought us a booster seat (Group 2/3) rated for 40+ pounds, we told him it was the wrong seat and would be illegal to put our child in. He then brings back a baby seat (Group 0+) which our child won't even fit in and said thats all they had and he couldn't conjure up the child seat we rented and argued with us instead of going to figure out a solution for a child seat we were guaranteed. Eventually we told him we were going go get a refund since we legally couldn't drive off without our 2 year old being in a car seat. He comes back a few minutes later with the exact seat we rented. This was extremely stressful on us, and unprofessional.
There was also ALOT of unrecorded damage to the car and we were afraid we would get charged for on return.
Besides that, the car was great, the return was very quick and easy and didn't get charged anything extra.
I will probably give them one more chance.