A family of 9 of us used him a couple of years ago. He was wonderful and very flexible. Takes you to Dunns River Falls first to avoid the crowds (so early that there was maybe one other group there), drives through Fern Gully (has some people who are waiting for you to show off their wares but can say no thank you politely). He provided us with an excellent overview of the area. We asked him to take us to a place for jerk chicken and he dropped us off at a wonderful BBQ place and then came back to pick us a bit later. The only part we didnt like is the shopping area. He took us to a very touristy spot which included their flea market which was terrible (offered drugs, pulled into stalls by vendors, etc) If you are interested in shopping I would do some research of other possible spots and avoid the normal place he takes you. For the record, we bought some jerk chicken spices and sauce only to find them available back at home.
Good luck, Peat is a very nice man and you definitely will not regret using his services