Did you pave the driveway yourself? Did you prep or just lay it, and did you reinforce it with rebar? It would suck if 5 years down the road it starts breaking up in large slabs because of soft earth underneath.
My brother in law is a contractor, and he did it. I live in a pretty rocky area, so we didn't bring any gravel in. The previous owner of the house put down some gravel, so it did have a little there. But, we did get 5,000 psi concrete - and industry standard is 3500 psi (IIRC). It contains the fibers of fiberglass for reinforcement as well.
EDIT: Here's a photo the night before

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