I'm not too sure about the CroFab, but the old stuff has been compared to having liquid fire traveling through your veins. I don't really remember most of my snake bite experience, I was in ICU for a week, and doped up on all sorts of shit I can neither spell nor pronounce. I was bitten on the hand by a ~12" baby atrox. I do remember that my left arm ended up swelling to become larger than my leg. My mom tells me about it every now and then, swears up and down that she has no idea how I still even have my arm, much less 100% usage with no visible damage.
I've seen atrox bites that more or less destroy every piece of soft tissue in the area..yet you can't even tell I was bitten, unless you look really close and see the scars from the bite. Someone was looking out for me that day.