Not sure it matters if anyone has "intel" - its a total viva lottery and unlikely to be same?
Not so much, the real lottery is being the first to turn up for a particular ad. Once someone's reported back, you have a much better chance of knowing what you're getting.
Not saying it's unheard of for two girls to work from the same ad and switch around, but it's far less of a gamble than just taking a punt on a random Viva ad.