I swore I would never do it. I was never grossed out by Moon Cups, but I just never, ever thought it would work for me. (I also had no problem with tampons, as evidenced by this sonnet...) This is probably due to the fact that I once tried Insteads back in college, and that felt like I was getting fisted by the devil holding a dessert plate, so I assumed the sensation would be similar. But you guys encouraged me and I'm pleased to say I am a very, very happy convert, so thank you!
By the bye: anyone who wants to try, might I suggest insertion method #2, pictured below. The traditional way doesn't work well for me, but I've had no problems with #2.