$99 is around the same price as the Russian 91%,i paid $95 for mine,and it is the same as the KFL+ with the exception,the 91% airflow can be adjusted from the top side of the device the KFL+ can't.There are those who will argue the quality of the 91% is not worth the price tag,i think it is and worth every penny of the price.I also like the finish on the 91% it matches a few MODs i own which was another of the selling points for me.Vaping is all subjective,taste,flavor,devices,etc...not everyone prefers the finish of the 91% and probably would not have any MODs with the same finish.Basically it all comes down to what you like.