Your new wellness vendors presentation showed impressive results from their work with other clients risk factors reduced, cost curves bent, and ROI blossomed. It all sounds terrific.
Before you sign the contract, you might want to take a look at the smoking guns list on They Said What?. Smoking guns are vendors whose marketing claims did not hold up under scrutiny. The sites scrutiny is not so technical that a layperson would glaze over. Its basic math and business logic.