Guess I got lucky and got mine before the rush. After using it a lot after my initial purchase I rarely even use it now, but there are numerous reasons. I'm not happy with carrying extra batteries, which I would often have to do (just in case). The threads on the tube are softer than the regular, so I try to minimize how much use they get. I also had another eVic head for it, but after giving that to my bro I rarely switch tubes, only to charge my 18350 bats. I switched from the ugly silver tube to a black tube and although both are 18650 tubes, the black makes the eVic look smaller and sleeker in my hand. And my biggest reason for not bothering to switch from my 18650 tube to my 18350 tube 9 out of 10 times is because the 18350 tube really isn't that much smaller, maybe half an inch, and I'd rather have more battery life. Now I know everyone will have their own opinion, but my 2 cents after using both, goes towards a black 18650 tube.
Btw, I got mine from good prophets out of pa, good luck on your search.