The client list there doesn't appear to be particularly current. Just some they have worked with at some point in time, I think. I've shopped about 50% of those clients for other MSCs in the past year.
Also...just because you have 1 Hilton doesn't mean you have them all.
I think I may have had some communication with them at one point, but didn't pursue it. I'm not into integrity shops, which they promote heavily, so that's kind of a turn off as well.