没有广大群众信心那么大。在这坛里我泼过冷水的有 solar, 3D printing, IBB, social media ... 还有”可穿戴的“。 很多人知道 UP (made by Jawbone). 我了解其核心技术，基本是忽悠。下面这篇文章有这样评价 which I think is correct and funny 

They're just toys. Expensive, cool and ultimately useless. If you're tired you need more sleep. You should walk more. If you don't go to the gym or exercise regularly a smart watch won't change that fact unless it comes with an app that lightly electrocutes users as a punishment for sloth.

https://finance.yahoo.com/blogs/breakout/nike-kills-fuelband-as--wearables--revolution-dies-before-it-begins-145640361.html