Almost 2 years now with my Pebble Time Round and nothing has come out that remotely interests me to replace it. I'm contemplating buying another one as a backup but I'm worried that iOS 11 or some other update will break some of the functionality and that'll be it with no one to support and update the App.
On a side note, Amazon has heavily discounted their prices on Pebble Watches since they went under. Tempting prices and their software is still supported.