I too Peter decided when I increased my weight to just over 13 stone enough was enough, so I put myself on iron rations and drastically reduced my alcohol consumption.
8 months later I'm now under 11 and a half stone, feel much better with only 4 or so pounds left to go, this will put me back to where I was at 30 a mere 25 years ago.
Disadvantages so far are none of my trousers fit anymore and belts have had to have more holes punched in.
Advantages, the M3W accelerates quicker and just how much would it have cost me in time and effort to decrease its weight by 15kgs.