I use these things a fair amount, sometimes running 300ft+ of Cat 5 cable from stage to FOH for instance. Huge time saver and can save the day. One unnerving thing about them is when they fail, they can fail spectacularly especially when phantom power is involved. Since all 4 lines share a common ground, if the ground conductor is compromised, there goes all 4 of your signals at once
For mission critical signals, I usually include a spare cat 5 line to those boxes so we can swap it over just in case
I suspect in install applications where the cat 5 is being run through a stud wall and terminated to two wall plates, there is way less chance for damage than in a touring situation where you're unwrapping and wrapping it up twice a day