I held a T1 for the first time this weekend(didnt get to use it). I was thoroughly unimpressed with the build quality. it seemed way too plasticy and didnt have any real heft to it.
Without the batteries the main body has no real weight, that's true. I find it to be a positive as there is no unnecessary bulk. Any of the black/white sleeve/tip material would be delrin, which is by default a "cheap" plastic, although that doesn't restrict it from working well in many applications including this one.
additionally the thing would rattle if shaken.
If the tolerances were tighter the sliding action would begin to seize from the smallest residual debris buildup, among other issues. I always liked the simplicity of the open ended tube floating there, the real problem is that the buildup of debris and skin oils make the sliding action unreliable without consistent cleaning.
This was the main benefit of the sliding side "safety" in the Cera, but as the front latching switches are now out the window it's been displaced by a depressing action on the tip which we will have to live with in the mean time.
based on their commitment to durable materials on the cera i was pretty shocked when i held the T1.
To me it is an issue of relativity, particularly in the context of Chinese e-cigarette build quality and rebranded products of that quality marketed towards concentrates. I have yet to see a single "pen" that was remotely comparable to T1 build quality.
This being said, im sure that there arent any unsafe materials used on the T1. i was just suprised that it didnt seem anywhere near as tough as the cera is going to be.
It is hard to say what is "going to be", OF has the only one "in the wild" and I'm not so sure what that even means at this point, if anything. There is always going to be a weak link and it will be discovered sooner rather than later.