I don't have any feedback on the newer ones. I have an Instinct(1) Solar, I got the solar model because I thought it would mean that I wouldn't need to charge it on a hunting/active trip due to being outside so much and it could recharge, it doesn't. I have never seen the projected battery life go backwards, even when I left it on my dash in the direct sunshine all afternoon. The research I did before showed that the non solar models had significantly better battery life. Maybe they have fixed the charging rate or other improvements with the later generations but I was not impressed with the solar charge feature.
I love the other aspects of the watch and would absolutely buy again, just the solar feature wasn't worth it.
It's not the feedback you requested but hopefully it helps you or someone else.