I have always used Lee hand primers. I had the older, circular model, and I loved it. When it finally broke after thousands of rounds primed, I opted to go with the new square Lee hand primer. It can be frustrating at times, make sure that the second up is in good position, but I feel as though I can seat the primers with good feel. I was just putting some CCI LR primers in some nickle .22-250 and it was tight, but I could feel when it was bottomed out. Nice and tight as well.
I will say the new square Lee set is pretty nice in the respect that you change complete trays. There is no need to have to change priming pins or anything, as they are self contained in the tray now. And the square shape makes for dumping half a box of primers in your tray awfully easy.
Just my thoughts on it. Shoot straight.
-shm