My husband has a very successful jpouch for 10 years. He had 1 blockage 3yrs post take down, due to scar tissue. But now, he eats whatever he wants (except for gassy/spicy foods). He never had pouchitis or any incontinence/leakage. He has about 6 BMs per day and 1 BM at night (which can be reduced if he takes immodium). His only complaint is the occasional butt burn. He drinks tons of water and takes probiotics daily.
My 15 yr old son just had step 2 of 3 and is doing well. His take down should be in June. We pray his pouch is as successful as his dad's.