I have been a LinkedIn Premier member for for well over years and have found it very useful and the best way to network and to find additional business. This is where professionals meet and probably the best place for referrals and testimonials. It has got more expensive as the site has got older and older but ~I suppose that comes with inflation and success. I find the site gives you lots of Kudos when hunting for new business and it really gives you an opportunity to install trust in yourself and your proposition.