I think it would be a great thing to keep in a BOB! There are an awful lot of fur coats out there with Mr Conibears name on their hides (I supplied my fair share when I was a kid)! No doubt, if you know how to use one, you will eat well and have fur to keep you warm! Hell, I caught one of the biggest Brook Trout I ever caught in one on a submerged set, it was delicious!
Rats are Rats big or little and they should all die but they dont need to suffer. I always liked the fact that they were about as merciful a killer as could be, snap and dead! I found way too many legs in my foot traps even on drown sets, that always bummed me out, not only did I Lose my $3.50 for the skin, the rats now hobbling on a stump. I caught more than one that had only 2 legs left (didnt hurt the price of the fur
About the only thing I ever had escape one was a Mink (I think). Tore that set up terrible and bent the jaws just enough to squeeze out. I cant imagine how but there were tracks all around. I didnt set for mink, they ere tricky and few in numbers, and viscous little buggers!