I bought one when I got my Loadsmasher. It works well enough. At $45ish for the powder measure and charge die, it wasn't too bad since I wanted to keep my Uniflow by its self for if I want to do single stage stuff on the Rockchucker.
The only complaint I have is how it likes to pee powder all over the press. I'll stop, tune it back up, and go again. Half an hour later I'm back to using words best kept in private. Charge weights are consistent, it's just the granule or two of powder that seeps out adds up after a while. Kind of like my Jeep, it leaks enough to be a constant annoyance but not an actual problem.