After 1 day uses of the Smart keyboard..few thoughts.
No home key is a big minus although you can use Shift+Cmd+H to trigger the same function. However, you can't double trigger the home key shortcut to call out App Switcher screen.
You can still use CMD+Tab to call out the Simplfied App Swticher but you can't close app from that.
No light / volume up down keys is a minus too.
Other than that. The typing feel of this keyboard is GREAT!! Even feel better than my Solar Powered Full size Logitech keyboard. The texture is so good and way better than Surface Pro. And almost instant on and type and fold into typing mode.
After installing the back case and keyboard, I feel the weight is almost the same as my the other Modal flip case purchased from Bestbuy and didn't add much weight on it. Good!