I use it when my wife is away for an extended period, but it's not a cheap option unless you happy scrape the bottom of the psycho barrel.
It's a lot of effort but to weed out the crap but you can find what you're looking for. A lot of them chicken out at the last minute, so expect to be stood up quite a bit. Also it's a lot more like dating, except you almost always get laid on the first date. You don't just walk into a room and fuck, wining and dining is expected first, as well as you renting a nice hotel room. All of these costs can add up.
The upside is that for the price of a cup of coffee you can check the girl out before you put any money down.
There are basically 3 kinds of ladies you can find there.
The most numerous are the wannabe premium escorts and when you get through all the BS they are expecting usually between $300-$500 an hour.
The second most numerous are single mums which are a bit of a minefield as I've had some stalker like experiences from them but they are cheap and eager to please. Their bodies usually have some baby damage but if you can get past that I've found for around $150-$200 you can get a MILF for an entire day while her spawn is in school.
The third category and in my opinion the best are the university students. Some real gems out there. The girl I'm seeing currently from www.seekingarrangment.com I pay $300 if she stays with me all night and $500 to go away for the weekend. Plus hotel, dinner, drinks and breakfast. And don't expect she'll want the buffet. Expensive but it you're after an extended GFE with a 21 year old hottie it's probably the best you can do.