Update at ~20hours, I'm convinced enough to stock up!
Sorry I don't have a macro lens, but here are some closeups.
That one string has been unraveling since it's been strung, and the loose end hasn't grown since. With the Gaucho stuff, if I saw a string unraveling, it'll keep unraveling and I knew a pre-mature rupture is a few hours away.
I break a lot of strings. At 20 hours and still sitting pretty, that's just gravy on top! I'm very happy the durability of Mamba Premium Natural Gut.
As for playability, I do not notice a drop as time goes by. Soft and comfortable, excellent pocketing, excellent feel, and apparently, excellent durability in my book.