I was waiting for you to start this thread, Ferg. This line definitely deserves it. I read that Casio designed the Oceanus line to be sporty dress watches, using high grade materials and incorporating their most advanced technology, which explains how lightweight and thin most of these pieces are. Last March I picked up a near-mint, pre-owned OCW-G1000B-1AJF from a seller in Japan as a way of testing the waters since I was new to the line, and as you mentioned, there isn't much English-language material available about it. I work long hours in an office environment, and I've been very pleased with the fact that when I wear this one, I forget I have it on, which isn't something I can say about other high-end Casios like the MR-G and Pro Trek Manaslu, which I love equally but are built according to slightly different principles (namely shock resist and outdoor use).
Titanium with DLC coating, sapphire crystal, tough solar, MB6 and GPS sync, this thing packs a punch in its build quality, technology and fit & finish. Like many other Oshis, the metallic bits on the dial (namely the hands and indices) are tinted in very subtle bluish-green highlights, so when the light bounces off the dial, it reflects off the AR-coating of the crystal and makes the whole dial glow in an aqua-colored resplendence. Very special, which is what you'd expect when you dish out the extra dough for pieces like this.
In any case, I am now 110% sold on the line, so have pushed the button on my second Oshi, which is the OCW-G2000-1AJF that harald-hans and James142 already own. Should arrive from Japan later this week or early next. Looking forward to sharing photos and impressions on this thread.
I'm in between this line and the Seiko Astron line, has anyone ever made a comparison?