CHBS was another centralisation/cost saving idea, which will not be improved on in it's current guise. The bottom line is that on more than 75% of occasions I have used CHBS, I could have got the same or a better deal going direct to the hotel or chain (even Expedia).
It takes just as much time to fill out the paperwork as it does to make the call anyway...
Waste of time and money, IMHO.
SBG