I've seen Willman's PETT in person a couple of times now. Looks like it sets up like any other tent, with (collapsible?) tent poles, stakes and such. Takes him 3 minutes, tops.
What I like about the PETT over the Porta-Privy, is that it all folds up like a camping chair or roll up camp table. So it would be easier (for me) to stack it up with the Zodi, two camp chairs and the potty chair in the FWC. The discus shaped Porta Privy was just awkward to store for me.
Here's a pic of the Porta Privy in action the afternoon before it bested my gentle disposition.
I should say that normally the PITA pack up procedure wouldn't have been enough to get me all fired up, but it was the last morning of a 3 day trip where we encountered a few more annoyances than I'm used to.
Oh, and I changed the hose and shower head from the stock Zodi unit to a kitchen sink trigger-type dispenser. The pull & push head on the Zodi unit was so-so at best. The trigger sprayer was much better although I could have used an extra foot of hose. Too short to go through the access sleeve on the back of the tent. For $7 at the hardware store, it was a great upgrade.