I've recently started taking the Metamucil caplets. BEfore Iwas taking the Prodiem granuals, but they're being discontinued so I'm slowly moving over to the caplets.
Compared to the prodiem, the metamucil caplets seem to bulk things up better, although I have also had a bit more cramps from them, not sure if that's just cause of the switch. I like the convience of the caplets, even though to get the recommended dosgae you have to take 5 of them at a time.