The only bad thing is, if they don't work.Not technically a fault but there's no benefit to it.
My goats are good producers/milkers... I just leave 2 kids on for 1. they grow better, and 2. it is way easier on the mom's udder, no matter how many teats they have! Like I said though, I know people who leave 3 on, and that works well for them. Yes it is inconvenient to have to pull 1+ as a bottle kid, but I like to do it that way.Some breeders don't have good milkers to cover all 3 kids, so they have to bottle feed,having 1+1 teated Does, it can be very inconvenient at times.