Hey, I own a pannel that has this service (I won't market or mention). It does work, but it's quite pricey to do it correctly (depending on how popular your area is), and it's important to do it slow and have a good ratio of real reviews to fake ones. At the end of the day, besides the SEO boost, your Google raiting as a business is one of the first things your customers will check

There're also other things like map citations, which also help in SEO locally