If you have used the press-mounted RCBS swager, then you can gauge that yourself, by looking at my video where I'm swaging, then uniforming the pockets, as well as deburring the flash holes. It's just easier....easier on me and easier on my press. The new RCBS tool cost me $85. The Dillon 600 Super Swage is very similar, and has been around for quite a while. There are YouTube videos of that tool also. Similar quality...little different stroke, $15 to $20 cheaper.....if that matters that much. Both are great tools.
My Video using the New RCBS swager: (click the picture)