As contractors we know how quick clients are to complain if something is wrong. Therefore I thought I would drop you a line to let you know how pleased we are with your DIY systems. Having now fitted 6 or 7 sets we would like to thank you for the technical telephone support offered on the one occasion it was needed and for the precise and simple instructions given. We would have no hesitation in recommending your products and would be pleased to talk to any of your prospective customers should they require a reference.