You will get alot of advice from agency owners like this. Best bet is to do a search on the site and check out reviews before simply taking someone`s advice on any given SP. A recent review of Koie is
here.
The difference is, the agency simply wants to get your business, whereas a review will give you a taste of what the SPs service is actually like from someone that`s tried her. This is not to say that the girls suggested by the agency are not good. I`m sure alot of them are.