So, I'm thinking about picking up one of those colored Izumi track chains to really take my color-coordination nerd-dom to the max. Check it. Does anyone have one of these and how do they stack up to the other models like the NJS variations? My only concern is that they are not track specific.

Don't do it! Here is what businesscycles has to say:

Caveat emptor: The Model V and ESH shown above are the only two Izumi chain models that are described in Izumi literature as being designed for track racing. Be advised that Izumi's "Eco" models are not track chains, despite erroneous claims you may occasionally read elsewhere (one website that listed them as such has since closed down, so I see them on ebay now mostly). The standard black Eco model is described in Izumi literature as for "baby carriages and . . . minibikes" (they don't mean the motor-driven kind). The variations of the Eco chain that are plated in a tacky gold or silver finish (the plating adds some corrosion resistance over the plain black model, but they're otherwise the same as the black one). Just because a chain is 1/8", doesn't make it a "track chain".

I've been using the plain silver one on my beater for 9month now, and I think I will need to replace them soon. It's a lot better, beefier chain than sram I had before.
The one you linked on ebay is a bit over priced, as I can get same one from condor for £13, only in silver though.