I haven't personally, but I have several friends (whom I met in my Bradley Method class) who did, and they ALL said the natural birth, sure it was painful, but being able to full experience this once in a lifetime moment, the birth of that child, was worth it and much better than not feeling the pain, but loosing the rush and all that comes with natural childbirth.
I would recommend find a natural childbirth class, not what the hospital offers. Its worth the money if your hoping to have a natural birth. Its more than just about information in most of these classes, its really get you to believe in birth and process, which I believe is key to getting through it. Looking past the pain, its only part of whats happening, vs focusing all your energy and thoughts on it. And Really teaching you that it will be over, and you'll have the baby. Amongst many other things! Also, perhaps hire a doula, a doula can be great for helping you manage the pain, reducing its effects with natural coping techniques and suggestions, help you work through your fears, also help support your support persons, so they can help you vs hinder your process.
BTW, the ring of fire is no big deal. Its a hurdle though. What I mean it, you have to know its coming, and know what you have to do. Push through it. Its mentally challenging sometimes, because your brain is saying "no! that hurts" but its important to know, yes, it hurts, its supposed to, and all I have to do is get past this last big step and I'll win the race. I remember getting to that point with my DD, and when I felt it I just thought ok, I know what I have to do, and after a long labor, I wasn't going to let what I KNEW would be a short period of intense pain, keep me in labor a moment longer!
Good luck, you can do it!