As a solely MTL vaper this item was purchased purely as a possible option to the various Kayfuns and Russians that i use.,and im glad i did. Everything about this clone is IMO excellent,its packaging and quality of manufacture is completely thorough in its attempt at copying the original. Two of the only things that i cannot confirm is whether ( the contact pin and posts are truly gold plated ) and i think not,and whether the coating used on the removable base is comparible to original. The item arrived ,looking and smelling totally clean but,was put through the Ultrasonic to verify. Disassembly was easy and threading was excellent quality,the base housing the coil and wick has a three pin position cam locking effect and i found that a small amount of modification to the lugs was needed for the locking to be completely smooth. A simple sand with 1200 grit wet and dry paper to remove any straight edges from the lugs binding on the receiving mechanism. Easy top fill proceedure, with plenty of space for juice bottle tips, no need to drain juice when rebuilding coils or re wicking,just twist base to remove position , Fully lock position closes juice tank for traveling or pocket , twist base to open position to allow juice flow and vape. (3 base positions) Air flow ring with multiple positions allows for huge range of variables and once set does not seem to move from set position when using RTA. Glass tank is very well protected from accidents due to SS sleeves design and shape. Now the test, single coil, 26# kanthal ,2.5mm dia @ 1.00 ohm and at 10watts. Air flow ring set at 50% of one only opening (there are three air inlets). Original drip tip removed and replaced with a smaller internal throat drip tip .(tighter draw) Wicking with Ken Do and used extra cotton to well fill the juice base .(65/35 juice) as i found that just wicking through the centre of coil was not sufficient and caused some dry vape. Juice usage when vaping was comparible to my favorite RTA,s . This RTA is now one to keep and will be now amongst my favorites as it produces excellent flavor and a dense,gently warm vape that suits me perfectly.4 out of 5 and only due to modification required and narrower drip tip .A Chinese made almost Swiss movement. Hope this helps other MTL vapers.