IMHO, it all depends on how you plan to ride your bike, if you plan on riding it hard and if the warranty has no restrictions then I would say it sounds good. If you are just gonna cruise around <which would be basically impossible> then I would say no. But, either way make sure that the warranty will cover damage no matter what causes it, I say this from have a purchased extened warranty on a 4x4 truck I bought back in 93. I took it out mudding and evidently I got "too much water and mud into the intake/motor" and it wasn't covered by the warranty so I hope my scenario will help you decide.
JC