I ordered & recently one of the new Lee handheld primer seating tools (square primer tray & red cast body). It requires the special shellholders (not the press type) I ordered the shellholder set also.
I tried it out for the first time last night. I had an older batch of PMC .308 brass w/ very tight pockets. I seated Tula primers. The tool worked flawlessly. Changing shellholders or the primer tray is simpler then the RCBS tool. Though the RCBS tool works perfect also.