I have the HCigar, ehpro and authentic Kayfun 3.1. Don't ask me why I'm just crazy I guess. Both of the clones vape every bit as well as my authentic.
However I would suggest the ehpro over the HCigar for three reasons. First the fill hole on the ehpro is a lot easier to use than the HCigar. In the ehpro I can use anything from a syringe, plastic bottle tip and even a glass dropper with some luck. Second, the ehpro has one feature I actually feel is an upgrade over the original. The top cap O-ring is inside the flavor chamber hole making it to where that O-ring doesn't get stuck on your flavor chamber every time you take it off. Third, the screw on the bottom for the 510 connection doesn't connect to your positive post at all. This makes it easier to clean and also makes it possible to drill out your airhole if wanted.