I abused it for about 7 months along with push ups/chinups/crunches in 2007.

Before:
http://userserve-ak.last.fm/serve/252/357779.jpg

After:
http://boldaslove.us/wp-content/uploads/cb22c2afb564affedf8ae4693c8314e4.jpg

I was eatin it outta the can with hot sauce, washin it down with milk and an apple. It was self-contained and mindless, completely miserable portioned eating. But I never saw weight fall off my body like that. And I never got frail lookin. Just more muscular and carved up.

So I advocate the effectiveness of replacing meals with fish when you can, but God knows, I absolutely despise the taste/smell/experience of tuna.