If I had to do it again, I would've started with the lux instead. As it is the lux or X are on the short list
The "X" also uses Silver plated contacts ~ thus is a firing champ like the LUX. It is my 2nd most favored. I say 'second' because I like the form factor and the feel of the LUX (22mm vs. 23mm / Alu-Bronze vs. Steel).
However, the "X" is value for money too ~ b'coz for that price you are getting all the sections for any 18xxx series battery. Has an AFC and an awesome switch. I'm vaping on a "X" with kayfun Lite as I write.