Haven't actually touched them yet, and sorta ordered them on a blind...I hate ordering the newest models, because there is almost always a problem...Some would argue about who's idea this actually was but I have been talking to Kanger for six months about PCCs, manual batteries, bigger carts, bigger flavor selection, and higher mah on their batteries...I am personally not so entusiastic about manual batts or longer batts...The Kr808 is somewhat flawed allready with there cartomizers...There is the possibility of burning cart material if they are abused or not given time to wick properly...Many people have suggested rotation of carts to eliminate this or going back to the original cut off times on the original batteries...I personally dont see much difference with taking 3 hits in a row or holding down the manual button, as far as causing a cart to burn...This is why they incorporated a cut off in the manual batteries...Another thing to keep in mind is that there are patents on the Integrated Atomizer, Pcc, and Manual batteries that many Chinese companies have ignored...Green World Tech owns 2 of these patents and is currently persuing legal action in China for these patent infringements and will certainly win...It is just a matter of time until you see at least 2 large popular companies revamp there inventory of products that they produce...