"I am writing to say how pleased my wife and I are with the replacement windows your company put into our home at the above address at the beginning of the year..."

"I am writing to let you know how pleased we are with the level of service we have received from the time we first contacted your company..."

"I should like to take this opportunity to offer m thanks and appreciation for the efficiency, are and consideration exercised by everyone involved in the fitting of my replacement windows..."