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For that kind of money I'd definitely want to benchmark it against the new Garmin Fenix, which is also solar charged. Garmin are pretty good at GPS and you can get a few days of GPS use in Ultratrac mode.
The solar charging takes a long long time to fully recharge the battery after a day of GPS. Days of full sunlight even. Both for the Fenix and Casio I think.
https://www.dcrainmaker.com/2019/08/garmin-fenix6-pro-solar-series-review.html
I do need to try one on before I commit, it's not exactly pocket money.