istick 50/subtank - Kanger Subox/subtank - Heatvape Defender/GS Air M
Subox came in the mail today - just a few hours ago...
As you may know by now 'hand fit' is a priority for me. All else - wattage, style, tank accommodation, spring loaded center pin, placement of fire button, weight, etc. etc., are important but how it feels in the hand - the most common interface - is more important to me. I don't have a scale but weight on specs from vendors sites post 4.3oz for the Defender without a topper and 5.99oz for the Subox with the Subtank combined. With the GS Air M, the Defender feels lighter to me. I understand that not all agree as to what's important and that there are different sizes of hands

Just pointing this out for those who like the Defender or the istick 30 and are looking for a replaceable batt mod that is very similar in feel, the the Subox would fit that category.
All these have rounded corners. The 50 is 45mm wide. The Subox is 39mm and the Defender is 35mm. While it wouldn't be a 'deal breaker' the 50's width is not as comfortable for me as the Defender. And the difference in the width of the Subox is hard to detect from the Defender. At one point I had to look at which one I was holding. :- ) That wouldn't be the case with the istick 50W.
I have the same take on the center-pin on the Subox as Suzas "although when I push with the pin it gives in and comes back." but it's not as apparent as the spring loaded thinner pin on the Defender. Both my Lemo and Lemo 2, The GS Airs, Kanger Emow, Aerotank V2, Aerotank Mega, Kayfun 4 clone/Taifun all fit and fire on the Subox.
I put the 1.5Ω OCC in (came with the 0.5Ω coil in place) and it's vaping well. The 'new' smaller air hole setting in the AFC is nice and have been using that. Each selection clicks into place like the former Subtank.
I think I've 'found' my replaceable batt mod and, barring any severe problems, will likely be getting 2 more in the future. If the "deeming regs" come down hard, maybe more

I'll be looking for the 1.5Ω OCC replacement coils - so far haven't seen anyone who sells them, even though they are selling the new Subtank and KBox mini separately now. If someone spots the 1.5Ω coils, give me a heads up :- )