Panther was something I got somewhere local, but I think it's a Stone Barns variety, and they have a similar climate to me. I knew I might be in trouble when it made huge plants. The bean size is pretty comparable to the pic above.
I feel like I should add, in Panther's defense, this year was whacky, it was grown in saturated soil, and did better than it's neighbors at tolerating it. The cabbage that was on one side just rotted, and the normally 5' pintos on the other made spindly 2-3' vines with a couple pods each. Panther was a little pale for a while but kept going. I wouldn't necessarily encourage others to write this variety off from my experience this year, especially if they cared more about edamame than dry seed.
I did grow Bei 77-6177 at the other end of this garden, and it was much earlier. I think I'd be saying that when comparing Bei-77-6177 to most things though.