Just got my capsules, and here's my initial thoughts.
First, they are very well made, nice and heavy with the metal and glass components. I haven't had a chance yet to put liquid in them, but the seal looks like it will be tight and secure.
Comparing to my GermanBat set, they are near identical. I'd say the biggest difference is the color finish. Whereas the GermanBat set is definitely black with a few slight rust discolorations in some spots, particularly around the knurling of the back cap and the scoops in the middle, the Paragon set has a more even tone across all the metal parts and doesn't really look rusted, so much as what I might describe as a gunmetal brown. It's a great color, and I am honestly torn on which set I like better. Width and length are almost exactly the same between the sets, and there's only a very slight variance in how the middle section details line up when side by side. So the good news is I won't have to redo the foam in my Vault door display to swap these in (at least until I get the Paragon Batarang).
The only thing I'm just a little bummed about is I thought that like the Grapnel, the COA might have individual unit numbering and it does not.