Hello Benjamin. I've got a '57 ambi-silette. I can't say I've felt the need for a grip yet, but I've only used it with the 50mm so far. I've got a 90mm and I'd love a 35mm in a bubble-case for a 90mm.
I did own a nikon fm2n for a while with tamron f3.5 70-210mm. Big and heavy, I wanted a handgrip with that.
An ever-growing amount of photo-stuff and a never-growing amount of photo-talent.