I have 8 EVODs now and can most assuredly say that the ones from MBV are genuine Kanger. I have 2 clones from FastTech among those 8 and one of the most easily discernible differences between the genuine and the clones is that the genuines have 3 air holes along the bottom while the clones have only 2. I don't have etching on any of mine, including the genuines, which came from various places including MBV, EmpireMods, DiscountVapers, and AquaVaporCig.
Another major differences is in the wicks and the coil on the clones. On the clones, the coil head is much lesser quality overall and with the 2 FastTech clones I have, I had to replace the heads after only a couple tanks due to leaks. There's also an extra o-ring/sealer/gasket (I'm not sure exactly what it is other than a clear silicone piece that sits on one of the ridges of the clone head) on the clones. And finally, but not always, the threading on the clones is a bit rougher. We got the 10 pack of clones from FastTech and split it between my mom, sister, and I, so I've seen some that have held up better than others when it came to the clone coil heads.
Finally, several of my EVODs, both clones and non, leave condensation in the tips. That seems totally dependent on the juice and the wattage I'm vaping it at.
I didn't discern any height difference between the genuines and the clones when placing them next to each other... but I didn't take a tape measure to them either so if there's a millimeter or two difference, I might not have noticed. I'll try to measure them later to verify. I don't know why you'd see a height difference if they're both genuine however. And unless MBV's supplier is duping them, and their most recent stock contained clones, the one I ordered from them on 7/19 (and received a few days after that) is definitely a genuine. HTH
PS I have 2 stainless steel ones, a genuine and a clone, neither has the etching.
PPS the clones will often have a machine oil taste to them (you can sometimes but not always smell it too) and need to be either boiled or soaked in everclear or the like to get that taste out before you use it the first time, otherwise your juice will taste kinda icky.