"Many thanks for an excellent job very well done."
"We cannot thank you enough for all your help, it is really appreciated."
"Thanks very much for your help - I would never have been able to do it without your assistance."
"Thank you for all of your help in getting us up and running, and I see we are on your portfolio. I will take every opportunity to tell people of your excellent service."
"Thanks very much, you're fantastic."
"You're amazing. Don't know how you do this stuff."