Here’s what consumers have asked with answers from Reservation Counter staff and previous consumers.
Trying to cancel a reservation, the rote voice said it did not recognize the phone number, even though it was the same phone I used to make the reservation. Then asked if the reservation confirmation number started with an R. I said No. It asked me several more times. I kept answering No. Then it told me to call the hotel for help and hung up. Called the hotel. They said they could not cancel since the reservation was made through a third-party company. That I would have to cancel through ReservationCounter. (Oh, by the way, I had tried to use the online Cancellation page - it doesn't work.) It was very difficult to get through to anybody and there were very long waits in between. I will never use this company again.
When I was on Marriott's website (marriott.com) I selected option to make a reservation. I made reservation (still on marriott.com). Confirmation came from Reservation Counter, which was the first indication that they were involved. In fact, it's the first time I ever heard that they existed. Crooks is a little mild to describe them.
Any of them! Booking.com, Airbnb, Expedia - I can't think of the rest. Reservation Counter also charges a $14.99 booking fee, which no site I know of does. It's rate was almost twice what I paid for the room I had booked directly with Hilton