I have been a Purple Port member for six years, as designerphotography.
It is an excellent site with great photographers and good models. Because of its excellent reputation the site has grown considerably over the years, so occasionally you might find someone masquerading as someone they are not. However, admin do a brilliant job weeding these non desirable's out.
The site has a lot of functions and analytics so you need to take time to get to know how the site works and would always recommend a newcomer gets advice on how to make the site work for them.
One of the most important aspects of the site is its peer review system allowing you to see the reviews left for photographers or models by others on the site who have already worked with them.
Highly recommended