I share your favorable opinion about the Vertex RB & FP. I've made several and am happy with them. We have done very well with the Vertex click, it is the first click that I've been able to sell.
When the zen was new I made a couple and disliked them so much that I gave away one and threw away the other. I've been looking for a magnetic cap that isn't so clunky and these seem promising.
We haven't had the RB $ FP at a show yet, but we will in a couple weeks. If they sell well I will learn to like them quickly. I've also made several of the Vertex pencils, I have high hopes for them as well.