Haha, yeah pigs have great memories! I would honestly neglect to plug in our pig fence most of the time, but after an initial couple of shocks they would never test it again. Even when I had taken down a section of fence to move them into a new paddock and the fence is nowhere in sight, they would get super suspicious of crossing over the invisible line of where it used to be. Sometimes it would take several minutes of coaxing! Ahh, I miss them, can't wait for spring!
I would say that 99% of the time we used a single ribbon on our fence. I think for the first couple weeks I had both a high and low ribbon and maybe one other time I added a second ribbon in a tricky spot. The extra work didn't seem worth it to me, but also there was no real disaster if they got out.. they always either went wondering to find me or came wandering back home, since those big mountains of
compost never seemed to magically appear anywhere else.
We moved our pigs every week or so and it took anywhere from 4-800 ft of fence to enclose their paddocks, depending on the location, which were all long rectangular strips on contour. It was not an efficient use of fence, but the pigs are multi-functional and we use them to terrace a forest edge hillside around alleys of trees. I figured the ribbon would save money and time, since I had in my head that netting would cost around $1/ft and ultimately be heavy, cumbersome and overkill for pigs. But now I think that the "half height" netting, while not exactly half the cost, is still probably worth it in terms of time and reliability.
It's weird. A couple of years ago, I was dreaming of replacing the sheep and cow electronet with an easier setup, which I always imagined was a set of reels with ribbon or polyrope. I dreamed of taking the time to train the sheep to stay inside two simple lines of fence. Now this just seems like a total pain in the ass and I am a lot more settled on just keeping the netting, no matter how much I have to curse when it gets tangled up.