Anyone lay their own concrete?

If you have the ability, doing the subgrade compaction, any embedded services (piping/electrical), reinforcement, and forming can save you a lot of money. I did that in my shop myself and a local contractor charged me $1.50/ft2 to place and finish a 1000 ft2 floor. He brought seven men at 8:00 and by 9:00 it was poured and floated. Two guys stayed to edge and trowel and that was the end of it. Total charge including concrete and a small concrete pump was $5400.