Users can download workouts to their devices from companies that have partnered with Microsft such as Gold's Gym or Men's Fitness. This allows for one to find workouts that fit their needs that are created by people familiar with what should work the best.
There is a built in heart rate monitor that is always monitoring and for the most part it is consistent in its tracking. This way people can get a full view of what their daily heart rate is at any given time.
Auto tracking will begin recording if it thinks you have begun an exercise. It has been known to randomly start tracking an exercise (like cycling) even when almost stationary, resulting in a very inaccurate exercise summary. There is no way to turn this feature off.
Peak has an optical sensor with a brighter-than-most-competition LED and a good photoreceptor. A brighter LED helps avoid much more channel interference and a good photoreceptor can gather more data. It allows the device to take better measurements in motion.
Peak can track light, deep and REM sleep, along with documenting "tossing and turning." This way the user can have an accurate reading of how they behaved when sleeping in order to judge if they are getting restful sleeps.
There have been reports of the Basis overheating and causing burns. The company recommends that people not wear the track until they distribute a software update. They are actively working on the issue. You can read more about it here.
The watch can adapt to the routine one is using for their workouts in order to suggest other workouts the user may be able to handle. This basically works as a simple personal trainer, which can be encouraging to the user.
The Gear Fit has a vibrant sAMOLED display that's bright enough to be easy to use in a bright environment. It also allows switching the orientation of the display layout from the default horizontal to vertical.
The heart rate monitor seems to be often all over the place with its tracking. Often it will be reading an extremely higher rate than what the user has, which will not only throw off their data but could also interrupt ones exercising.