I work for a global outsourcing company. Among our many talents, we provide contact center services for companies all over the world. I work in that particular business, and know from almost 10 years of experience that "customer service" isn't just about the person who answers the phone when you call. It's also about the quality of your experience in placing an order (and I know that some people have had website issues with KP, I'm not one of them), as wella s getting accurate and reasonably quick delivery of the products that you ordered.
I've placed two orders. In February, I ordered my Harmony set (with which I have had zero problems, and there is almost always something on my Harmony tips!!) plus some laceweight yarn that's yummy but a bit difficult for me to handle, so sitting in the stash for the moment. I liked my set so much that I ordered 3 sets of metal tips in May, along with two sets of Harmony dpns for socks. Love, love, love them all. Love the points, love the quality, etc. I am finding that I actually like the metal tips better, because there's no drag from the transition between wood and metal, so I can see an order for the metal tips set in my near future. I like the Harmony dpns, as well, but am struggling a bit with them only because I don't knit with wool (allergic), so I'm using really grabby yarn - makes it a bit tough...but probably not ready for metal dpns, either...may just have to learn magic loop or to do two at a time on circs or something.
Anyway, I'm another vote for "KP is great, this sounds like sour grapes", but can't speak to the quality of the yarns, since I've not used them much, or the customer service representatives, since I've not had any reason to call.
ETA: The KP sock blocks referred to here are similar to Conjoined Creations' Flat Feet, which my LYS carries, except Flat Feet is hand-dyed for you, while KP is selling you a blank chunk of knitted-up yarn that you can dye/paint for yourself and then knit from the end of the block. It's a cool idea. Wish they'd do these Bare blocks in something other than *^%$% wool!!