I've taken it, it's been moderately helpful. The one time I thanked my lucky stars for it was when I'd been up all night with non-stop D which some Immodium finally kicked, but my stomach was still *gurglegurglegurgle*. I took some hyoscyamine and it settled it right down. But like people said, it might soothe some of the rumblings and maybe some of the pain, but probably won't stop the D. Sometimes it makes me a little drowsy.
Now, my dad tried taking it and it not only didn't work for him, but it gave him some side effects that freaked him out at first. He woke up one morning after being on it a few days and said to my mom in a panic, "I can't see!" His vision was blurred so badly he couldn't read or find his way around. It cleared up very quickly after he stopped the drug, but since he didn't know it was a side effect, it freaked him out at first.
So be aware, dizziness and blurred vision can happen with it, but I still think it's worth trying. Let us know!