I am very hesitant to support a smartwatch that locks features behind a subscription, even though I don't particularly care about the sleep analysis.
I don't really see who this is for anyways. If you want a fitness tracker, you are better off with something from Garmin or FitBit. If you want the best smartwatch experience, nothing comes close to the Apple Watch. The Galaxy Watches are cheaper and have more size/style options.
This is just another copycat product line that exists solely because competitors have them and probably won't exist in 3-5 years.