Well.. after a week's use of the 2ZM, I'm very satisfied..
With two Molicel P28A batteries I can get about dozen sessions of 3-5 draws each before reaching 3V. Of course, don't hesitate to recharge as often as possible.
The 19/26 glass connection offers several possibilities, if a 19/26 stem is used, the rimmed of the basket screen is very, very close to the inner screen of the female glass which leads to much more heating (more conduction). I don't know if this is normal, but the two 19/26 mouthpieces I received with my 2ZM remain a little loose once inserted and allow the mouthpiece to be turned without having to remove it. Is this normal?
I know it's not good to remove the stem by turning it (it's better to rock it back and forth to release it because only a drop of epoxy will prevent the glass from turning (although it is also maintained by the superior holder)), so maybe it's normal? I have tried with other 19/26 stems from other manufacturers and this does not happen and holds firmly.
Anyway, 19/26 is not my preference. For me, using 19/22 or 19/19 stems is much better (more convection). Given the consequent heating of the 2ZM compared with my Milaana, I thought I'd have to use a mouthpiece with a high cooling capacity, but it's not the case. With my Milaana 2 I had added glass beads to my XLjr 19/19 mouthpiece because I found the draw a little too hot for my taste with the short stem. It turns out that the 2ZM airflow is much more consistent too, allowing me to use the XLjr without beads, which is just perfect (I like it when the airflow is very open and unrestricted). AVB is also more uniform without beads or using 19/26 (of course it depends on your preferences).
My method is relatively simple, I pre-heat for 5 seconds then I start to pull without releasing the button (not pulsing) but rather by adapting my inhalation (that is to say that I start very slowly and I increase progressively (like a sticky brick)). Once initial preheating is complete, you are able to make consecutive draws if you wish without having to preheat for each shot (at this point you may need to start pulsing according to your inhalations). This way, I get delicious clouds and despite the wood in the air path, Maple is fairly neutral and is one of my tastiest vapes (I'd love to see a 4Mi in Maple because I can always taste the Walnut). The size is also much smaller than I expected (in pictures it looks really huge, but the handling is really great and stays relatively cool compared to the TM toaster). Wood is also very well worked and expresses itself naturally. A 2ZM in 21700 (given that size is not an issue in this design) would have been really excellent. If you like unregulated vapes, I can only recommend it. It's a real beast!
I'm now looking forward to 4MD and 4Mi, which will offer a very complete environment