The main difference, between de-airing or no, is not having to wedge the clay. You turn on the de-airing vaccum while still mixing the clay. Then, leaving the vacuum working, you switch from mixing (let the auger completely stop) to pugging. After you have emptied the pugmill, turn off both the vacuum and the pugger. For heaven's sake, remember to open the vacuum line and release the pressure. By the way, the vacuum pressure should be between 20 & 25 PSI before switching from mixing to pugging.
I use reclaimed clay for throwing, else why have a pugmill? Mark, I don't work in porcelain, but porcelain is why they finally came out with a stainless steel Peter Pugger--because it's not supposed to compromise the clay.
I've had my Peter Pugger for almost eleven years, and my back and wrists thank me. It may keep me playing in the mud into my nineties, which is better than hanging out at the senior center's bar.