It's disconcerting that they need to mention "512GB", as if they found that "pauseless garbage collection was" not a big enough selling point (perhaps because for most server applications - where the big money Java apps are - individual responsiveness doesn't matter all that much).
It's also disconcerting, because (it seems to me) that big apps are increasingly a thing of the past, as we move to massively distributed smaller, slower processes - each individual JVM with its own smaller memory needs. Big apps seem to be an upmarket niche, disappearing fast. Whereas the great strength of pauseless gc is in realtime client-side apps - like mobile devices.
I think these guys have done something great here, and it would be a shame to see them pushed upmarket into oblivion, when they could create an entirely new disruption based on Java - perhaps (finally) fulfilling its promise... (and for the java-haters, also for other JVM-based languages).
EDIT Azul tech previously on HN (links include explanations IIRC): http://news.ycombinator.com/item?id=810506 --- http://news.ycombinator.com/item?id=2022723 --- http://news.ycombinator.com/item?id=2058476