I like them quite a bit. They add uniqueness to each character, are always satisfying to pull off and can lead to some interesting mind games in my opinion.
Throw KBs are harder to like however. Let's say I'm fighting a Skarlet and she grabs me. Her throw 50/50 is incredibly powerful because let's say she has me in the corner and goes for a back throw instead of the forward throw I expected because I'm in the corner. Due to my escape failing, she now has a true 50/50 that does 31% (because both her throws have the KB tied to them), where she can even bypass some of the 50/50 aspect if she does a throw in a situation where I don't expect it. Basically, if I ever fail an escape against a character with two throw KBs, there's a >50% chance I'm eating that damage.