Newworld-
Most J-pouchers live ordinary, healthy lives and have little interest in J-pouch support forums. The vast majority of J-pouchers are glad to have had the procedure, and would do it agan.
The rest come here.
Okay, that's a bit of an exaggeration. Nevertheless, this is a suberb forum to find out what can make a pouch difficult. It's not a very good place to find out about the typical J-pouch experience.
I have an essentially unconstrained diet, including popcorn. I took up Japanese Ju-jitsu after my pouch surgery, and I now teach it, and I similarly took up scuba diving. The pouch never stopped me from enjoying alcohol in moderation, which is all I was inetersted in. We have marathoners, skiers, and everything-elsers here.
J-pouchers will have more BMs daily than coloned people - about 4-6 per day is typical. Much more important is that a healthy pouch will cause no urgency to run to the bathroom for these events. The stool will be softer than a colon produces. J-pouchers are more prone to dehydration than folks with colons, but most just need to drink enough water. A healthy J-pouch may function better if helped with judicious use of Imodium or Lomotil (if you need to go longer before the next BM), and/or soluble fiber (like Metamucil). Some use neither of these, but their use is pretty common.
Folks vary in how long it takes for a pouch to mature. Many are back to work in six weeks or so, but the pouch is still adapting at that point and further improvement is likely.
Good luck,