What do you consider a "full service" agency?
A full service agency would have a physical place of business were you can go any time of the year and just pick the women you want to meet and they put them in front of you.
I personally take it from there and try my best to keep the agency out of any relationship that develops at all cost.
Some guys however like to get advice and feed back on what the girls really think of them and use the translators the agencies provide.