I use a Hisense A5 since about two years and the battery runtime of over a week is just excellent. Being able to use it in plain sunlight is simply priceless. The grayscale display is good enough and i don't miss color at all. The only thing that somewhat bothers me is that it can't be equipped with some non-chinese alternate ROM like LineageOS. Nonetheless, as it turned out to be much better than expected i actually bought a second unit as a spare.