I bought a 5s Saphire. It connects to my router and is paired to my smartphone. The Bluetooth disconnects even when it is near the phone. It will never reconnect automatically. I have to force a re connection.
When I go to Garmin Express on my PC, the software indicates no WiFi connection even though I can verify that the 5s is connected to the router from the 5s.
I get no notifications. I have enabled notifications in the 5s menus. I have also ensured that I have disabled "Do Not Disturb" on the 5s.
$700 is a lot to pay for a device that can't function without issues. I suspect the issues are the Garmin software rather than the hardware. If they want to sell high end hardware they have a huge incentive to make the software function easily.
My Microsoft Band 2 reconnects to my Smartphone automatically whenever I return to the proximity of my phone. I get notifications without problems on my Band 2. The Microsoft software is fantastic.
I have owned Garmins for decades and haven't had issues with hardware that isn't supposed to have as much functionality as the Fenix 5s.