Very good & practical
I have 5 of these. 2 PolyTuners, a Korg, a Peterson strobe, & some other Seiko quartz tuner.
These are worthy & accurate tuners. Not perfect, I mean its $15... but I find them 'al-round' VERY good value from money.
I still use it in the studio to tune with & it intonates better than both PolyTunes I have & is almost on par with the studio tuner.
Visibility is no problem in any light. Like all screens this will depend on angle. If you can't see it, change the angle. Any tilt or angle I have to make hasn't affect the tuning stability...
ProsAccurate, reliable, small, bright, good battery life
ConsPerceivable it might come across as not solid. but I play rock with them live & daily at home - no one has broken.
Wish list would be to have kitted out like the ploytune clip-on (aluminium, scratch proof glass etc - piece of mind)