Doubt: Is B&P shake a real good Bowel Cleasning?

I have been reading the messages here. I tried the P&B Shake yesterday morning and I couldn't last to the afternoon -- the consitpation from the shake made me so sick that I rushed to the store and bought the Renewlife's CleanseSmart and took 2 capsules as soon as I got it and took another 2 at bed time. I felt much better now but still feel some constipation.

I am wondering how many people here have really benefited from the P&B Shake alone. From what I know, Phyllium is a solusible fiber and needs a lot of water to dehydrate, which easily cause constipation instead of curing it even though I drank more than 20 cups of water yesterday.

I don't believe a good cleansing way should make people suffer. I am going to try the RenewLife's FiberSmart toegther CleanseSmart which contains solusible and non-solusible fiber or even colon irrigation. I think their theories make more sense.