The original and best use of cookies was to keep track of a site visitor as they moved from page to page - e.g. adding a Diamond Toolholder to your cart, then browsing over to tool bits and adding a few of those. Sadly the technology was easily abused, and here we are...
To the matter at hand, there is also the "Wimberley" toolholder, which ostensibly solves the 'problem' with the Diamond - that sharpening needs to remove a lot of metal. Unfortunately (at least if you own a large-ish lathe) the Wimberley only uses a puny tool bit (1/4"?). I have both although I've used the Diamond way more. The Wimberley's best feature, imo, is that it can't foul the compound if you use a long blank.
They both work great and they're easy to sharpen, but once you master grinding conventional tools they lose most of their shine.
GsT