I have the K100 and its amazing! I love this little thing i know it's telescopic but i keep it in 18350 perfect for my stealth vaping needs. As for it being interchangeable with parts form the genuine empire, i saw a review on the K100 from Demitris(sorry if i spelt it wrong) the vaping greek on youtube and he puts an empire body sleeve on his K100 with no problem so im going to say yes it is indeed like an empire but at a much cheaper cost. Although it has it's differences. Not saying it is an exact replica but it's pretty close. The threads did need a little lubing but i just put a touch of chapstick on the threads of the top section and it's buttery smooth now! It's amazing in my opinion. It has a floating center pin so anything i put on it is able to sit flush on it with no problems! Don't get me wrong it has its pros and cons i won't deny that. But i mean come on a fully mechanical device that's pretty sturdy and looks pretty awesome has versatility with batteries and gives me a good vape and just for $35...no complaints over here at all!!
I mean sure i would choose the empire over the K100 i mean who wouldn't right? But since those are pretty much darn near impossible to get your hands on..i would take up the K100 and vape the beast haha! Overall it's a pretty awesome little device in my opinion 
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