I just recently bought a Craftsman 27333 46" 20hp mower that had the smart lawn installed. It is kinda cool but really unnecessary. It keeps track of your engine hours (the hour meter does that), alerts you of needed maintenance (the hour meter does that), and tells me what my battery voltage is (if needed a multimeter does that easily). It is linked to the sears website so if you choose you can order parts (at full retail price) from the app. It does have your owners manual in the app that is kind of cool. I like it but if I didn't have it I wouldn't buy it. Also the app will only update if you open the app while the mower is running. Just my opinion
Don