Other then the fact you pulled 6 months as the lifetime out of thin air, mods are changing so much these days. In 6 months time we will have the new favorites to pick from.
last time i've checked the provari has been around longer than six months, and most all of them are still in commission and vaping just like they were day 1....if you want brutal honesty, i've had many mods, and most of them are exactly as advertised: either cheap chinese pieces of junk (vmax, zmax, lavatube, etc.) or well made american devices that work masterfully (provari, reo, darwin, etc.) i've had a handful of the chinese made mods, including the lavatube V1, the vector variable volt, and the vmax.
...in all seriousness, NONE of them lived up to the expectations, the Vmax lasting me only a week before the chip fried, the lavatube having the top plastic piece of junk crap break on me within the first month, and the vector tore a seal on the center post on the second day i owned it....
compare to the provari...the thing is legendary, i've had mine for about a month and a half now, and the thing is going strong as ever...every vape is exactly the same as the first, no matter where the battery level is, no matter what day of the week it is....it simply outperforms everything i own....and instead of being made out of cheap copper plated in some expensive looking metal, it's actually solid stainless steel....which you'd be hard pressed to say about the acrylimax, or hell, for that matter, even the zmax or vmax.