Is this a good deal? please only good bikers?

yeah man, go ahead, i was at a local shop recently and found that same post for well over 90, its a good deal. that is if you are a good rider, carbon can warp and or shatter depending on its quality, as long as you aren't trying to beat the dirt jump record i would say your all good. also make sure you like the feel of the new seat post more than the old one, most bike shops should be able to refer it to you and will give you a general idea of what it feels like. last, carbon will add value and appeal to your bike.