So, just received my black IPV4. Before expanding upon my initial observations, I should probably disclose that throughout my shortish vaping career, I've been largely attracted to "high" end mods. My first mod was a ProVari and until this last purchase, I've been rocking a VaporFlask. Anyways, I'm pretty impressed with this guy. The paint job looks sick. I'm particularly surprised with the build quality. It's funny, having spent around $200+ for most of the mods in my collection, I'm usually excessively critical of build quality and chip function. With the IPV4, I can kinda just enjoy it.
Most importantly, and this could be attributed to initial excitement, but I'm pretty sure my IPV4 does temperature control smoother than my DNA 40 devices.