This is wrong btw.
Since the Hero 5, Go Pros have been waterproof without the case. The current GoPro is waterproof to 10 meters without a case or 60 meters with the case.
Compared to the current iphone which is only water resistant, so can be submerged for 30 minutes, upto 6 meters.
Another Venu 2 owner here. It is great, does what I want from a smart watch(notifications, calender, heart rate, sleep and some other stuff), ties in nicely with the Garmin cycle computer I own, and allows for tracking between the two. And I get 3 - 4 days(or more depending on how much I am using it to record activities) in a single charge. I do kinda wish I had gone for a forerunner, but I dont wear it when cycling and it tracks walks and runs and everything else under the sun perfectly well.
Definitely recommend a Garmin if it fits your needs.