Only the states of California, Oregon, Minnesota and Texas minimally regulate professional home inspectors. The field is so wide open, virtually anyone can print business cards, calling themselves home inspectors. Home inspectors' competence varies widely. Retired general contractors are often the best inspectors because of their construction experience. It will be time well-spent, especially if the buyer's agent is also present for the inspection.
Inspectors are usually glad to discuss any defects they discover.
My experience has been inspectors often make important comments that never get into their written reports. To illustrate, I recall one professional home inspector telling me the water heater was working fine but was nearing the end of its useful life. He was right. About a month after I bought that house, the water heater sprung a major leak. However, don't expect home inspectors to know everything.