To put it simply: ask people who have the Pebble. Most of them incorrectly believe it is an eInk screen, but it is a reflective LCD.

I also have the Metawatch. These are purely reflective, not transflective. They boast whopping 20:1 contrast ratios -- https://www.sharpsma.com/products?sharpCategory=Memory%20LCD... . Even at its best days (carta) eInk didn't reach that 15:1 https://wiki.mobileread.com/wiki/E_Ink_Carta , and nowadays it's more like 10:1.