re: Is this a solid quote for concrete?

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Why is do you prefer that?

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Keyways not only allow for controlled joints, but the shape of the keyway has a "c channel" built in which helps prevent either side of the control joint from sinking or rising independently. Both sides of the joint "lock in" to the keyway similar to dowelling.

A regular saw cut joint is completely at the mercy of the substrate. This is actually the cheaper way to do it. Metal keyway costs around $10 per stick (10ft) plus cost of stakes.

Let them know if you'd rather cut joints and it should save you money. If thats your preference.