Completely agree with UCarp. Can give you instant credibility when you travel. Also many of the traveling girls coming to KC only advertise their trips on P411.
The ease to set a date up, is what I like about it. So that is what makes it so good. Plus like Wildcat mentioned, some touring girls use it as their only ad. You said you want a long term arrangement. I am sure the girls there will do that for you. Otherwise find one on Seeking. Those girls are hoping to find one or a few to basically pay their way.