I agree with all the LA's comments.
We all know that a square block is not always a square block, but we deal with it. but it sure is helpful if:
Long threads are cut, loose odd threads removed,
top and backing squared, (Yes, measure the middle and square it instead of the borders),
pressed, (although if shipped to me they seem to need a bit of easy pressing anyway),
a good quality batting if supplying your own.
And odor, pet hair free.
I have had wonderful experiences with my customer's quilts. Guess I've had the good ones! I look forward to their repeat business!