Tsptic alerts are. Easy to miss unless your in a quiet environment . Maybe that's the way it's suppose to be.
The reason why I say that is because there is a prominent TAPTIC feature to turn on which adds a sound to the alert
I thought it was weak at first, but I was comparing it to a Pebble. I have since bought into the "Reality Distortion Field (TM)" and gotten used to it. Furthermore, I am able to distinguish between different types of notifications (Message, Fitness, Mail, other) based on the tap it gives me.
Really organic and natural notification system once you acclimate to it.
Tuck