It's a personal decision but I personaly do not ever buy extended warranties.
Problem one is that the particular problem you have is hardly ever covered and you can never be sure of getting your money's worth ( not putting down Suzuki's warranty, just warranties in general ).
Second if I add up all the money I saved by not buying extended warraties on my bike, cars, fridge,stereo, etc... I have more than enough money to cover about anything that comes up.