I use Wera stainless steel screwdrivers daily, both the regular stainless steel as well as the insulated stainless steel.
Never had issue with them being soft in any way at all.
They are designed to be used on stainless fasteners in environments where rust would not be a good thing. IE food/beverage processing facilities. And I have used them there as well as all other general uses.
I mainly wanted them because I have had issues with rusted tools in my tool bags working in the humid Florida environment and rain.
They also seemed cool.
I have never had anything to say about Wera or the stainless line of tools they offer.
So, I would say order them and give them a try.