Hello gentlemen, my name is Mauro and I live in Italy. For the past few years (5/6 years) I have always used Fitbit. With my latest Fitbit Versa I had trouble getting my heart rate correctly. The Fitbit, despite so many precautions, gave me 40/45 heartbeats less than the chest strap and the manual count. I had pre-ordered the Fitbit Sense but on the day of shipment I read about errors in reading heartbeats on many online sites. I canceled the order and ordered the excellent Garmin vivoactive 4 (45mm). It is a new experience: it is like going from a small car to a much more luxurious and comfortable car. The menus are very complex ... but very complete. How long has the vivoactive 4 been on the market? how long will the smartwatch be supported by the company?