Drop off is slightly confusing
Pros: Everything went well: they were polite and professional and efficient. The car was in great shape and easy to drive. No one tried to scam me and claim I damaged the car weeks after I left it (so far).
Cons: Dropping off at the Bangor airport was a little confusing - there was no one in the rental car return parking lot and all of Budget's parking spaces were full. I had no idea what to do, and they had not given me any direction about drop-off when I rented the car. However, this was easily solved: I just called the number they provided, a live human inside the airport answered, and gave me clear and useful instructions from there.