"I am just e-mailing to say that I ordered this item around mid-day yesterday and was very pleasantly suprised to have received it in the morning post.
A big thank you and well done.
Thanks a million
P.S. what a fabulous website you have as well"
"My order arrived today, many thanks for the brilliantly quick response"
"Thank you for your quick response I received my order yesterday and I am very pleased with it, your service is excellent!"
"The goods arrived today. Thank you for your promt service"
"Thank you it arrived next day...very speedy"
"Many thanks for a professional and helpful sevice"