Glad you mentioned the seed saving issue with Grandma Gina. I grew it this year for the first time. The source had trouble with a large percentage of the seed splitting/sprouting. I grew it in a warmer location (South side of a building) hoping the extra heat would overcome the sprouting issue. It did - but for me, a very large percentage is deformed, under-developed seed. I've got a tub full of pods drying, but after A LOT of effort, I'll be lucky to get a hand full of good seed.
Too bad, because this would otherwise be a great bean.