My brother had the J-pouch about
15 years ago (when it was pretty new). He had it done at Mayo in MN and they did a great job. He had been sick pretty much constantly for about
2 years before deciding to get the surgery. He's had a few infections/pouchitis and a fissure once during the 15 years, and of course he uses the bathroom alot during the day, but all in all I think he's better off. For him he looks at me and sees that after 17 years (I was diagnosed a year after he was) I haven't had the surgery and was doing fairly well till recently. So I think that gives him some doubts, but his UC was much worse than mine right from the start. He was on Prednisone for over a year, tried the nicotine patch trial which didn't help him. There was nothing else at the time (no other drugs). He also doesn't exactly watch what he eats (I can't believe what he can eat for how tall/thin he is!) so that doesn't exactly help his bathroom trips :)
He did talk to others who had just had the surgery (he was in the hospital for a few weeks before deciding to have surgery) and also looked at some forums I found for him. I think if your disease isn't responding to meds its definitely a good choice. He's had I think 1 colonoscopy since the surgery and they did say after all those years the pouch stretches out into almost a little 'colon' (not really but bigger than it originally is) and that helps a bit with the bathroom frequency.
Good luck with whatever you decide!