Authors have said:

thank you for a superb copy-editing job ... You have definitely contributed to a better book (Palgrave)
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careful and sympathetic editing (Gower)

thank you for your thorough and incisive comments (Sutton)

my thanks to the editor for the skilful editing (OUP).

Desk editors have said:
I was very pleased with your copy-editing ... your changes were exactly what the text needed (Ashgate)

a pleasure to go over your work (OUP)

thank you very much for all the good work you did, under time pressure, on a very complex subject written in a second language (Library Association Publishing)

we’d much prefer the job to go to you, as you’ve done such a brilliant job with the others (Library Association Publishing)

congratulations and many thanks for your very careful work ... we greatly appreciate your continued commitment (OUP)

[one of the co-authors] has written to say how much he admires your copy-editing (Macmillan)

the author was very happy with your work ... many thanks for your efficient work again (Thomas Cook)

thank you for checking the proofs so thoroughly [and] for your conscientious work (Arnold)

very pleased ... no complaints, perfect, first class (HarperCollins)

very impressed (Elsevier).

For details of testimonials please send an email to read@sfep.net.