I have one, I liked it so much, I bought another...
Yes, I have two
I have one set for large and one for small primers. They are a bit of a pain to adjust and have work properly so for me it wasn't worth changing.
After having these for several years now I can give some insight on them.
They are finicky, adjustment is critical and sensitive, so different brands primers dont run the same through it the same. So if you switch from say Winchesters to CCI, it might need a slight tweek.
My large primer machine works better than the small. I dont know why, it just does.
The machine needs to be close to level, and dust free. The tray needs to be clean.
Wolf primers made a big mess and I will never use them in the machine again. Yellow powder stained the bowl and I cannot get it off. The yellow did cause operational issues until it was mostly removed.
When the machine is set properly it works really great and very rarely get a flipped primer.
The adjustment is the plastic arm it needs to be tight enough to kick out flipped primers but loose enough to let good ones pass. To loose you get upside down primers, to tight they dont get to go into the tube.
Theres a few more tricks I can add to.
The bowl must be inline with the base or the filler tube must be square when installed. You can adjust this by loosening the big nut on the bottom.
I also add a rubber O-ring on the top of the tube where it contacts the bowl. I cant say for sure it helps but it seems too.
So to sum it up, they need to be tinkered with. Its all about adjustment. If your mechanical and can see how and why things work it might be for you, if not you will be frustrated beyond belief.
I bought both of mine used via an auction site, as they didnt work properly
I guess I need to fess up here, I have adjusted, repaired many many vibratory feeder systems at work. So I have a pretty good understanding of how and why these work. As far as these systems go this is pretty basic.