For my husband, there have been many pro's. Of course, a lot of them are related to no longer having the disease, but some are bag related. He was sick for 11 years and fairly young (26) when he had his surgery.
For example, we were able to take a week-long trip to a theme park this summer, which we never would have been able to do before. Having the bag allowed my husband to walk around for hours, eat what he wanted, and enjoy the park like anyone else-- something that would have been impossible while he was sick.
Also, he does not have to explain the bag, or tell anyone about it, if he does not want to. When he was sick and running to the bathroom over 10x per day, everyone we were around knew something was wrong with him, and we always had to provide at least a brief explanation.
The bag has given us freedom- taking road trips with over 8 hours of driving, walking around malls or museums or theme parks, no constant worry about where the nearest bathroom is, as you can empty at your convenience, not having to wake in the night to use the restroom if you don't want to.
The road to get here hasn't been perfect, or necessarily easy, but 16 months after surgery, it is certain that having the ostomy has improved everything about life.
Husband was dx with Ulcerative Colitis in 2000 at 14 years old. We met in 2002, married since 2007. Proud owners of 2 miniature dachshunds.
Meds tried: Methotrexate, 6MP, Humira, Tacrolimus, Remicade, Imuran, Cyclosporin, Flagyl, Asacol, Sulfasalazine, Pentasa, Rawasa, Pravastatin trial and Prednisone. No remission since 2008.
Total abdominal colectomy with semi-permanent ileostomy on 7/1/2011