Thanks to everyone who replied. I went ahead and ordered it yesterday, and it got to my "local" sort facility tonight - so barring any incidents, I should have it in my hot little hands tomorrow.
I'm sorry, I can't remember who was talking about the MVP - I went to the MVP after I my last Sig Zmax failed and I had to return it - I think it was V3 - then stepped up to the VTR after that. Durability, the MVP was excellent. But having to charge the whole thing rather than swap out batteries, even if the built in battery lasted a danged long time, was a PITA (which is why I upgraded to the VTR). I can't go back to the MVP now, although I was fond of the box mod before my hands got as bad, but with the MVP being a necessary thumb trigger, I just can't manage it long term - as in several hours a day.
While overall, my VTR has been durable, I use the extension thing so that the tank isn't sitting down in the recessed hole - for one reason because even with longer drip tips, I felt like my face was right up against the device when I dropped the tank into the slot, and for two, because it seemed to me, especially now (although something COULD have screwed up with it recently), the draw when you put it down there was tighter. But now, I guess after I dropped it the other day, at least, this was the first I noticed it, I noticed that extender was bent. It actually looks somewhat funny, lol.
But I'm excited that my Zmax is almost here, and I'm going back to a menu that tells me exactly what voltage is left in my battery (something the MVP would do, but the VTR does not do, you just have the range of green, yellow, red).