Because I have been using my Infinity for like 2 weeks and crapped out on me. I did buy it used but it was fine when I got it. My vv mods never get hot, never shut down, the batteries last forever, barely any, if any voltage drop under load. Ok I am done complaining, I have a provari also on the way (New) I have high hopes for it. But I got to say I am a vape hog and these TI boards are incredible.