Kamry 20W: 23 x 49.2 x 84.3
iStick 20W: 21 x 32.8 x 75
At almost a centimeter taller, 1.6 cm wider, and with those sharper octogon edges than the iStick 20W, the Kamry 20W will feel different in the hand. In fact, it's slightly bigger than the iStick 50W (23 x 45 x 83), which holds TWO internal 18650 LiPos for 4400mAh. No overhang for most full-size tanks, though, which some people will appreciate.
If the Kamry 20W is calibrated to RMS and has solid 510 connector threads with a floating pin, that'd be good. Even with those improvements, though, I'm not sure how much of the 20W Mini market share Kamry can grab. Some, probably, but how much? I guess it was worth it to Kamry to take a stab at it and find out, since knock-offs seem to be the order of the day among the Chinese manufacturers in this very competitive, wild west marketplace.