It doesn't emit light, so you still have to pair it with a backlight. There are some pretty bad ghosting issues, so things that refresh frequently have readabil

It doesn't emit light, so you still have to pair it with a backlight. There are some pretty bad ghosting issues, so things that refresh frequently have readability issues. This also makes it bad for all the "smart" watch things - for a regular watch, e-ink would be acceptable, but could be replaced with a traditional watch face which draws even less power.