Seeing another comment on this website gave me an idea that is sort of a hint for all newbies who would like to try out iontophoresis for hyperhidrosis.
I just realized that renting has one big advantage over buying an iontophoresis device: you are free to try out various devices and compare how well they do for you! So, for instance, you can rent Fischer Galvanic MD-1 and use it for 2-3 months, and then rent Fischer Galvanic MD-2 and use that one for 2-3 months… And you can also rent other iontophoresis machines if they are available, and so on and on… You can try with the cheapest device and then move to the more expensive one(s), stopping when you find the one that stops your excessive sweat. 🙂