Not sure what the clones on fast tech are maybe it says it somewhere or others know.
My kfl+v2 clone is ehpro and its good , even with full air flow it to me is tight but that may suit some people.
Lemo is more airy and you can tighten it but some say the air flow ring can move - I don't have that problem with it at max has not moved.
The one I use all the time is also an EHPro. Got it from LiteCigUSA. Just checked and their price is $34.99.
Sent with no malice and not a whole lot of forethought from my new Galaxy Tab 4. Thanks Santa!