Is there any difference performance wise between the 2? I ordered the SS since it was the only one available. I have a titan which is my daily driver, a copper sentinel v3, Gus tele which is crap without modding the center post and botton contact and a private V2 which I am having replaced due to poor quality. I know these Chi You's are high in demand, so I ordered once out of impluse. Just wondering if it is worth it. I does come with a 18650, 18500 and 18350 tube which is nice, but what are the contacts made of?