I indirectly hired Concrete Solutions by hooking them up with my Service Magic General Contractor.  They are awesome!  Everything was done as and when they said.  They use 3000 PSI concrete as a standard, which puts them above other contractor in quality.  The slabs they poured are excellent. I am recommending them to anyone I know that needs concrete.  I have 12 years in construction myself, so I know what I am talking about.