So a couple of my friends and I all have K100s. Sometimes we swap mods when there is an issue with the rda to diagnose what the problem is. I was looking at my friends setup and noticed the side said "KeCig K100" on the side of the mod, whereas mine says "K100+" .
The one that says "KeCig K100" seems to be more prevalent on the internet. Here's a pic of mine next to the contrasting stock pic I could find.
K100+:
KeCig K100: 
Are these two different mods? Is one of them a clone of a clone?
For what its worth, 2 of my friends have had the "KeCig" one and both of them have stopped working. The most notable physical difference between to two seems to be the 510 connection. The "K100+" model has some ridges around the edge of the connection, and overall looks more sturdy. The gold outer tube on the K100+ also feels "threaded," like the metal has small micro-rings ingrained around it. The outer tube on the KeCig model, however, is smooth.
Can anyone make sense of these shenanigans?
The one that says "KeCig K100" seems to be more prevalent on the internet. Here's a pic of mine next to the contrasting stock pic I could find.
K100+:


Are these two different mods? Is one of them a clone of a clone?
For what its worth, 2 of my friends have had the "KeCig" one and both of them have stopped working. The most notable physical difference between to two seems to be the 510 connection. The "K100+" model has some ridges around the edge of the connection, and overall looks more sturdy. The gold outer tube on the K100+ also feels "threaded," like the metal has small micro-rings ingrained around it. The outer tube on the KeCig model, however, is smooth.
Can anyone make sense of these shenanigans?