Got my band in March of 2005. Lost about 200 lbs. So nice not to be hungry 24/7! Only troubles I've had were a large hiatal hernia, which was repaired without incident in 2010.
Usually, I gain a few pounds over the holidays and clean it up after the New Year. This year I did that and then immediately started gaining weight again. After I figured it out, (it took me a while!) I realized I needed a fill. It turns out I haven't had one in four years. My band was close to empty, so it's taking a few tries to get it adjusted again, but I'm sure a lot calmer with some saline on board.