But I view the value of smart watches in the $100,000+s if not $1M+s. How much is your health worth? How much is it worth to passively keep an eye on your heart rate, and stress levels, and oxygen levels, and sleep levels? Granted, I still think it is very early for smart watches, and the value we are getting now is ~1% of the value we will be getting from them in 5-10 years (if they aren't replaced by a "smart tooth" or "smart necklace" etc). But I think at this point the value is definitely there and easily worth 10x+ the cost.
Making a single actionable decision based on data received from a wearable could have a life changing impact.
And again, speaking in probabilities here, and it depends if you look at the data and adjust your life based on it, but I think expected value of these is huge, and probably the best single health measure anyone can take.
I would say try the cheap one, and think about upgrading if you like it.