The first two are 99.9% certain to be bait-and-switch. The girl who does come will be less attractive, sulky, unwilling to do anything you've agreed without a big mark-up, and accompanied by a particularly steroided Sergei who might just fancy relieving you of that nice phone... I've tried similar Backpages in the past and, honestly, avoid avoid avoid.
Isabella is about 50/50 in terms of bait-and-switch chances. Google one of the images (
External Link/Members Only) and you'll see it used for different-named girls at numerous agencies across London. Doesn't necessarily mean she doesn't exist (as an escort) but that's the staunch likelihood - and ditto that you'll just be send a vaguely similar woman.
Long story short: if you want a guarantee of getting the girl in the picture, Adultwork's your best bet, followed by some of the more reputable agencies.
G'luck.
