I used to use it when I travelled a lot for work and didn't have time nor the inclination to trawl through the sometime numerous profiles on AW, that was also before I became aware of UKP though which would have also saved me the time.
Anyway, back to RB's I only had a couple of failures where they didn't show which was a bit disappointing to say the least as there I was in hotel room all ready but then I guess that is how some of the girls feel when punters don't show.
If I travelled more I would use it but also alongside UKP to get a more informed view of the girls bidding.