It's nice actually. Gives a bit of gentle serenity while maintaing life in the Wasteland. Once watched a pack of molerats travel around for about an in game day.
Part of the reason I take it is because I don't like having to kill dogs. It feels icky. Plus, there's a bit of schadenfreude that comes from going against people who use attack dogs and suddenly seeing their companions turn on them.
And then there's this. 70% of the motivation for taking this perk is to avoid having to deal with Yao Guai. All of my characters died in their first encounter with Yao Guais because I never saw them coming until they had eaten my face.
And even though it didn't work on Yao Guai, I found it to be an equally considerable godsend in New Vegas to not have to worry about Night Stalkers. They always seemed to I've me more trouble than I expected.