I have never trained with one , but have seen a few that have , and from what they have shown me it can be a devastating tool in close range.
Just as some find no use for serrations , or the tanto , some will claim the K-bit has no merit. But it does , for its intended use.
I have one , a Tarani Masters , but I have no K-bit skills , however it does have utility uses as well. Mine is used to open cans of Copenhagenn
No sense knocking a tool , if you haven't really gave it a look at what it can do , with those who have trained with it.
I had the luxury of watching two groups of good folks doing verbal sparring over the benefits and shortcomings of Pikal vs K-Bit. Interesting discussion , and it really opened my eyes to the efficiency of either in trained hands.
Me , I carry my blades for utility , the 1911 is there for SD purposes. But I won't dismiss the K-bit as being non-effective , cause it is far from it.