Testimonials can seem similar to case studies, but they are not. If a client has received a good service from your business they decide off their own back to write to you about the service they received. They usually contain what exactly you did for them and the quality of the service.
Testimonials are definitely a great source to add to your website – you can even create a ‘testimonials’ page highlighting your business’ strengths to new and prospective customers/clients.
We have a testimonials page on our web site, which has a few selected testimonials about different aspects of our business. We are careful to not over-do it with our testimonials and we change what’s on the web site when we get new testimonials in so customers, either existing or potential, can get a real understanding of what it is we do.