Dealer cost is $1695 for 7 years / 75,000 miles bumper to bumper. Its 90% refundable at 7 years if nothing is used.
i am not sure if i should buy it or not?

Although it was my job to sell warrenties as an F@I officer but with Toyota you get lifetime drive train and 3 year bumper to bumper with car. They have cheapest cost of ownership and high resale. Do not get as most people do not use and if they do it may be for a 100.00 repair and you cannot get money back when expired. Just do proper maintenance and you should have no problem.