I use them on a variety of calibers/ cartridges. There is a wide range that they offer and will custom make one if you want.
The custom is ~$150 the off the shelf ones are ~$50.
Some people have trouble setting them up and Youtube videos, at least some of them, complicate the easy.
Mandrels can be purchased in different sizes to custom tune neck tension or if you want it smaller just machine a thou or two off the supplied mandrel.
They don't leave a donut like bushing dies can/do, neck thickness is not an issue as you are squeezing the neck against the mandrel, any imperfections are on the outside of the neck as opposed to the inside like a bushing die, your ammo will be straighter.
A lot of target handloaders just use the collet die and a body die and micro seater.
The weird part of it is they are so cheap people think they're junk or a gimmick....not so.
The only thing I do is clean up the out side of the actual collet with emery or crocus cloth and put a small amount of grease where the collet is squeezed.
Makes neck sizing and decapping a breeze no lube required.
Occasionally the shoulders have to bumped back but that's about it.
Higgison is a Lee dealer
http://www.higginsonpowders.com/images/Lee_Precision_2016.pdf also WSS as them sometimes.
You like them.