MTB warrenty is a funny thing....there are so many restrictions...I put a vari-travel fork on my Kona Cinder Cone (Zoke EXR Race 85-120mm), now my warrenty is void. so, I dont have much use for warrenty.....in my 15 years of riding, I never broke a frame.....I crashed a couple of frame pretty badly...but that was due to my misuse and lack of skills and not covered by warrenty.....I personally dont find any serious needs for warrenty for Aluminum Hardtails...specially something that cost under $300