I checked his work when I came home the first day. George didn't do as we discussed, and when I checked his concrete work, it was bad. I paid him for a day's work and asked him to leave. Afterwards, I dug out what was supposed to be concrete, with a hand-held garden trowel. I had to un-do everything he did and support the garage on jack-posts, because he had cut the studs but had failed to support the wall.
EDIT: I'm now responding to George's response. I took most of the concrete out the next day (when it should have already set). It was sitting on unstable fill, and most of it was still dry mix with virtually no water added (I have pictures). I believe it was George's helpers that did this, and not George himself. I hesitated to post my review, because I don't like giving bad reviews, and knew that if the contractor has the last word, he'll always try to discredit you to protect his name. Suffice it to say, I stopped the work, and not for the purpose of saving money, as it cost me much more to have it done properly. I only wrote the review after the work was completed by others. I cannot recommend this company.