I'm sure we have all heard this before, i know i have done it too when buying cheap stuff only for it to not last as you'd expect.
Today I had a client come back to me and say the plans he had done elsewhere are crap.
This customer came to me several months ago with some approved town planning drawing he asked me to prepare working drawings, I gave him a quote but he got them done elsewhere at half the price.
Now he finds out that all the drawings are wrong and engineering don't match, this is the part were i quote another great saying "I Told You So" now he has to pay again to rectify them.