Concrete Fix

We are in the process of purchasing a home. The home has some minor repairs that need to be complete by the seller before the closing. One request we had is for him to fix rebar and cement that is sticking out of the entry way of the garage. The seller wants to patch the concrete with a product called "Harder then Concrete." Has anyone ever heard of "harder then concrete?" What are your opinions of the product? Any recommendations on how this should be patched?