Lots of opinions on warranties much like oil and tires.
Just remember one thing. The warranty companies do it to make money. What ever the premium is, odds are your bike will need less in repairs. Not just the premium total but the premium total less administrative costs and sales commissions. Yes, there are many who know someone who had six engines replaced at no charge but the vast majority of vehicles need less in repairs than the cost of the warranty, a lot less. They wouldn't sell them if it were not true.