The one I got as a gift is a solar Instinct. I'll have to ask her what she thinks of it. I looked at the log of solar activity and it does keep track of solar intensity through the day. I just am not sure how much it impacts charging.
It depends on where you live. I got an Instinct Crossover Solar recently and as far as I can tell, in the PNW it provides zero benefit unless I were to spend all day outside, every day.