It's not really usable for most people except someone like Cloudflare that functions as a form of proxy.
I have to admit the concept of partial page caching on the client side is interesting, but I can see all sorts of potential for abuse. In our case, there's actually almost nothing that could meaningfully be cached though unless you're talking about caching individual posts and so on.
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No no, of course it's not usable on Wedge (in fact I posted on Off Topic), I just wanted to share with you what seems a really interesting technique for big CDN/proxies. :)
Except that as they even suggest, it's nothing new - and if it's anything else like their usual form, it'll be unreliable and/or cause spurious and mostly untraceable bugs.