"Diecast has nothing to do with any difference in the look of the two versions and you know it so by make a post like this?"
"That's two entirely different figures though. They could make the diecast version in plastic (and the prototype probably IS plastic so the pictures you see are most likely a plastic figure) and it would LOOK the same."
The point is, the plastic Iron Man Mk6 is a rerelease of a figure that first came out in 2011. The diecast one is brand new. It is better because it is the latest generation of figure that Hot Toys has made and built on the R&D of dozens of Iron Mans since, not because it is diecast.
The depressing part of all of this is if you want the latest and greatest designs and engineering in the classic armors and Ultron and Civil War stuff, you are stuck paying the $100 extra diecast tax because that is all they are making. If you want plastic you are buying HHP suits, old releases or rereleases. Or like me, nix 1/6 diecast and just buy a few gorgeous 1/4 suits and be done with it.
That's more the point I was getting at, and I didn't make that at all clear in my last post.
I'm well aware the upcoming dc VI isn't better because of the die-cast material. BUT, if you want the better version of a figure, it'll be the "diecast" of any given figure you'll be forking out for.. All primary Iron Man figures from this point (in all likelihood) will be marketed as die-cast, at die-cast prices. If they re-release any of the older figures in plastic, like they recently did with the IV and VI, and at the same time announce a total new 'die-cast' figure, the gulf between the two will probably be the same as the two VIs now available for order, and the prices will reflect that. It won't be the reverse. I just don't see them pouring what they've learnt from Mark 42/43/45 into an 'all-plastic' 47/48 figure, nor not using die-cast for the Mark 47 onwards.
So, as to the original question, "is die-cast worth the extra $$$?"... Yes, if you want the better version of a figure, Not because it contains die-cast parts, but because it is the die-cast versions they're putting the work into. I wouldn't be surprised if we see another palette swap of the Mark VII for some show or occasion in plastic, and a d/c VII (within a year either side) to add to the III, V, and VI lineup, and I bet the d/c will end up being the better overall figure.
And the HPP, well they'll no doubt keep pushing them out the same way they have been.