They do sell each part just like KP does. You can buy cables, needles or keys, etc. Plus they have a no questions asked replacement policy so it sounds about the same to me as KP. I saw on the Ravelry page that someone was able to use the Webs needle on a KP cable. Whether that will work universally remains to be seen. Here's there info that is on each page -
"WEBS cannot verify or guarantee that any other company’s needles or cords will work with Knitter’s Pride needles. But if you’ve purchased a Knitter’s Pride product from us, we guarantee the product 100% with our no-questions-asked replacement policy.
I'm not knocking KP by any means. I love KP needles!! I was just impressed by the size on each needle and the different color of wood per size. It's just another option for needles and a little competition never hurt anyone.