That Totally Wicked Odyssey CLL tank is impressive. There is a reason it carries a 5-year warranty; it is really well built. I don't care for the skinny glass "window", but the other side of it is that the glass tube is almost completely protected. The glass tube, btw, appears to be wedged into the unit between o-rings and is held in with a stainless steel top-cap. The seam for the top-cap is barely visible but can be seen if you look closely enough.
Totally Wicked USA checked with their UK engineers and confirmed that the threads are stainless steel. I don't know about the rest of the Joyetech Ego Mega line, but my Tron tank is looking like it's some kind of plated, brass-colored metal. (At least the metal seems harder than that used in my GS-MS tanks, tho.)
If any of my tanks survive the Vapocalypse, it will be the Odyssey CLL. PLUS, the vape with CLR coils is every bit as good as with the Tron. I'll probably buy another on the next sale I see.
Finally, just in case anyone is interested, Sweet-Vapes is selling the White VTC Mini with Tron tank for $34.95 + shipping. (Shucks, I wanted the gray...)