I found Rollerdor on line and having done price checks found them to be the most competative and best value judging by verification specs and price. I found the ,instruction for measuring up clear and easy to understand and Rollerdor are always on the end of the phone to help with any questions. Delivery times were good and flexible to suite both them and my self. My son inlaw and my slef fitted both doors in a day. We only had to make one phone call to confirm wireing, because the book is not in colour. As stated previously there was help at the end of the phone immiediatly. Great Buy Very happy.