Medela freestyle questions

Jill • Baby #4 on the way :)
I currently have a Medela pump in style advance that I've used with great success pumping at work through two babies until they they were over a year. But since my insurance will cover $220 for a new electric pump I want to get a new one to keep my old as a backup (or just keep one at home) in case my 5 year old PISA dies and then I'd be bum outta luck ;)
The freestyle sounds awesome for the rechargeable aspect and not needing an outlet to pump, but some reviews say the parts must be fully dry in order to work? With my PISA I'd just store the pump parts in my cooler at work until my next pump session,..but would that work with the freestyle?
Any other pros/cons I'm not thinking of? Other than price, yikes ;) thanks!
Eta- sorry I tried to make the paragraph breaks better but glow formatting is dumb I guess 😕