When I had my GRS, I had researched this technique. The bad outweighed the good for me.
Problems with the colon graft. Possible odor problems being the greatest. Much greater chance of complications some due to the bacteria from the colon. Possible digestive tract tears or infections. Longer recovery time. From my understanding this was only used if there was not enough skin available for the other techniques.
I choose the peritoneal graft, which is supposed to provide some natural lubrication Bad of that is it sometime provides to much and you have to wear a pad. I have not experienced that after the first 6 months and have been generally happy with the results. Coming up on the 2 year mark this June.