When I went looking for a cheap travel BC, I dismissed SS and AL backplates because I didn't want to carry the weight on the plane. I figured I could always get lead when I arrived where-ever I was going.
Even if I do someday travel to an exotic locale that doesn't have lead, I figure if 'all' my weight is in lead, I can take it with me only when I need it.
So, I started looking at ABS backplates.
Then I was surfing eBay one night and found something interesting...
A BC that is lighter and packs smaller than even an ABS bp/w.
Pardon me if you already know the evolution of the BC, but...
You know the plastic backpacks they used to use before BCs? Well, shortly after folks started using horse-collar BCs several manufacturers started selling wings that go on the cam band of the plastic backpack.
I bought a 70's era set (backpack, wing, nearly-hog harness, camband) that looks brand new for $30. It weighs next-to-nothing in air, is neutral in water, and packs in a space the size of a boot box. If it had soft harness webbing, I could probably pack it in a shoebox.
I originally bought it just to try as a travel BC, but now that I've used it a few times I eBayed my Ranger. Never dreamed I'd do that...
This is the closest I've seen in a modern production model, and would cost about as much as the DUI one you are looking at if you can get it without that silly inflator/noisemaker thing. I priced this one through the local retailer and they wanted $230 for it with the silly thing.
and
here's a wing like mine currently on eBay, but without the backpack (and you could probably get someone to give you a backpack).
Note: I'm not promoting either of these two items, just giving examples.
As others will be quick to point out, the bp/w approach is more versatile (you can bolt things to it, for instance), but for a lightweight, cheap, travel BC, I think mine is hard to beat.
Just wanted to present something else for your consideration.