It seems the only flaw we've heard from the KM3 is the sticky juice control on a few units. Fortunately they were able to solve their problem by exchanging the inner oring using one of their spare orings that came in the package. Mine sticks slightly when first turning but have noticed it improving with use. The other thing I have notice is the atomizer body does not get as warm as the KFLs and certainly not as warm as my titanium drippers. Don't want to compare to a dripper though because those are different animals altogether. But comparing to the KFL, the KM3 doesn't get as warm. The vape is a little warmer, but the atomizer exterior doesn't get quite as warm as my KFL's.