I booked a night at the Westin Boston Waterfront Sunday night. The hotel got the reservation, BUT they only got a reservation for a standard room. The Rocketmiles website supposedly was reserving me a parlor room. Fortunately the staff at the hotel are particularly good - he managed to get me a quiet high-floor room (there were a couple of conventions going on so it was a bit crowded). So as for experience I probably would not/will not use them unless there happens to be a really good deal (like I got this time - 1 stay, 10000 AA miles).