Yes, as a point of reference. Many phones have screens that suck when viewed in direct sunlight. I already have a dedicated phone that sucks (brightness-wise). I don't need another one ~ unless of course it doesn't suck. 550 nits ain't half bad.
It doesn't suck. It ROCKS in direct sunlight. Way better than Note 4 and ipad mini 2.
Besides nits, polarization can also be a factor. Wunderphone emits polarized light (so may not be visible with polarized sunglasses in landscape mode), but it's possibly the very thing that gives it such bright screen. IOW, not all nits/nuts are created equal.