I have a metal Potter and it does the job, but it can be a pain in the ass.
It's not a bad grinder but sometimes it can't evenly distribute the herb between the four cups or the herb doesn't want to get in the cup anymore so I have to open it and tamp each of the cups. I have to do this a couple of times to get all the herb I need in the cups for my sessions, it's laborious.
Now I use my BCG to grind and dump the herb in the Potter after like
@Vitolo does. The cups are easier to fill evenly this way.
I could just use the cups to scoop the herb directly in the BCG but if I need to fill four cups it's the way to go.