I had a lot of initial problems, but finally am able to sign on. It looks as if the back-end for reservations are handled by Expedia, which would obviously not be good for elite benefit purposes. I assume (subject to hearing otherwise) that if one calls up the reservation would be handled differently, at least for Marriott hotels.

The service is run by Aspire Lifestyles, which also runs that for the Citi Prestige card. I have never had problems with elite benefits by booking through the Citi Prestige card and Aspire.