Probably won't matter much outside, but I was pretty shocked how weak the backlight on these is. Seems even weaker after the software 3.13 update but that could just be my imagination.
Side by side with a 12 year old Garmin Etrex 30 both at 100% backlight. No flash, mid day, cloudy, fairly low light in room. Xero is 100% charged, no idea on the eTrex just grabbed it with whatever batteries it had in it. In person the difference is even more than the photo suggests. The one good thing about the older transflective monocrome displays garmin used here is they do quite well visibility wise outdoors with no backlight. A colored display would need a ton more backlight to be useable, so it probably conserves battery and color really serves no purpose in this application.
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Looking at say an iphone display the 100% brightness on the garmin is equivalent to an iPhone on about 10-15%
I have to be honest, while I love tiny devices as much as the next guy, I think I'd almost rather have a bit larger display and more battery life, something similar in size to the Kestrel HUD. Better yet add HUD features to it