We joined Harvest Hosts in 2014 and have stayed at 16 locations and visited 2 more. We really enjoy staying at Harvest Hosts sites - some for the scenery, others for the location, and others because we want to visit the attraction. Keep in mind that the hosts join hoping that people who camp with them will buy their products. We only stay at places where we know that we'll find something to buy.
Unless something has changed camping units must be self-contained so check the rules.