NunoMI can only tell you about the KC06 for I am still waiting for this drops shipment ... I am pretty much impressed, never had such quality IEMs, they sound just plain awesome. I personally don't think they are lacking any bass, but that depends on how much of a "bass-head" your are ... then you should probably go for the KC06A verson here.
I paid a total amount of $53.69 ( $46.99 + Shipping $6.70 ) and it took about 2,5 weeks to get the drop to my frontdoor in Germany.
As far as I can judge , I would buy them anytime again if I had the chance ;)