Yes, I have a couple of them and quite a collection of rotors. My son is using one of them and I don't really use them anymore as I do all my pistol stuff on progressives now.
If you are using it hand held over a loading block, consistant technique is important, off a stand it is just like any other powder measure but with a fixed cavity. I used one for years and still do once in while, never had a problem with one.