Quoting Emmiboo:" I've already had this out with a few guys on my FB page but I'd like to hear what you folk think. If ... [snip!] ... have the opportunity to feel that too seeing as they also want that baby. (I'm neither for or against this machine thingy btw)"
Labor isn't just a single pain, and then it's done. Contractions are recurring. It's not comparable to being kicked in the balls.
Labor is comparable to being kicked in the balls, several times, over a period of of several hours, culminating in one gigantic pain (pushing out the baby).