Sierra has some nice new features, hopefully it's more stable than the current one. I also liked the rename to macOS it's more in line with everything else Apple makes.
A friend has a MacBook Pro 2015 model with DVD drive and will be pleased to see Mac OS Sierra coming out as he feels El Capitan has bugs in it. One being the magic mouse disconnecting by itself and not connecting easily.
Sweet. I can use my friends phone to make purchases. There are times when I press a gummy bear against touchID and it goes in because she left her full finger print.