Haptics you can feel through a 7mm wetsuit? I'm impressed by that, although I'd not want them turned up that high on my bare wrist!
This seems like a winner for vacation diving. For those divers that manage a couple dives a year on the family trip to the Caribbean, you have a device you know extremely well from daily life and that you know you keep charged, rather than a standalone computer you kinda forgot to get serviced or, worse, have to rent. Big, clear ascent rate warnings in color. It looks more accessible than some inscrutable Suunto, especially with a companion phone app.
If I had an apple watch I'd wear this it on my other wrist to my Perdix just to get GPS integration and all the health monitoring too - interesting to correlate heart rate with events in the dive, gas consumption and so on.