FWIW; I don't use hand primers, but I gave three different ones a good try. One complaint was primers not sitting square in the "ready" area and inserting crooked, some sideways some upside down. I had to form a habit of looking at every primer as it sits in the tool before seating to make sure all are square...
I don't use hand primers mainly because I could not find one that fit my hand and was comfortable to prime more than 20-30 cases. I now prime on my Co-Ax, a ram prime on an old single stage, or my RCBS bench prime...