I have tried the "new" (in Canada, anyhow) Metamucil caplets, but they just didn't do it for me.
Plus I got rather nasty cramps.
I recommend psyllium husk, which I get in bulk (no pun intended) at the health food store. Works reliably.
I've found myself quite "bound" eating this WOE, but I have needed some help in that area for several years.