Like anything else it is pretty irrelevant unless they deliver on service. They say they are 20, they are 35. They say they are Czech, they are Romanian. They say they are part time, they are getting pumped 10 times a day.
Words are cheap, reviews by reliable like-minded punters are relevant.
I am awaiting the rise of the 21 year old, part time czechs on AW now, aka the same old slappers.