They're basically a continuation of the plain Orvilles just rebadged fuji made Orvilles. Build wise I doubt , other than fancy tops, there isn't much difference between the orvilles and obg's other than hardware and thinner 'ntiro' finish.
I've had quite a few MIJ epi's and other than the pups can't really fault them, each one has had a thin finish and typical high quality fuji made guitar, plus that Epi badge usually mean you can pick them up cheaper. I replaced the pups on a cheap LPC90, ebony fb, and it's still probably my favourite MIJ custom.