On first public beta my Tom Tom app would not load. This issue seems to be resolved in the second public beta.
Wasn't a major issue as the Map app gave me good driving instructions for the few days I was unable to use TomTom - I missed features like traffic warnings & speed monitoring though. However, if Maps keeps improving I'll need to think carefully about renewing my Tom Tom subscription next year.
My 6S is unfortunately permanently attached to a charger as the TCI (?) chip on the motherboard is fried, so the battery discharges extremely quickly anyway.
Charge on my 6 is fine, had no issues with it at all.