Have seen several pals go through the surgery. Google around a bit to see some pics. Involves a large scar all the way around the abdomen where the skin is removed and it's hard to conceal the scar. Same with the chest: usually extra skin gets removed there as well, leaving odd-looking nips.
Depending on the quality of surgery it can look totally weird or just a few scars that fade over the years. I guess it depends on how vain he is. It's expensive surgery and takes a while to find a good doc.
No amount of diet or exercise will remove the skin unfortunately.
Good luck