Why use a belly putter over a traditional putter?

the idea behind the belly putter is that it keeps your arms, shoulders and chest connected and promotes a more positive stroke through the ball by keeping you on line longer through the stroke - I have tried them and I find them to be a little bit uncomfortable - I am only 5'9" so I like the idea of getting right over the ball - I have a Scotty Cameron Newport that is cut to 31 inches to I can get my eyes over the ball - I can see how the belly putter has helped Sergio, he may have been getting a little too handsy or he may have been taking the putter back off line