I own quite a few older Case knives, but only a dozen or so modern ones. IMO, their quality began to drop in the mid-'70s following their purchase by American Brands, Inc., and kept right on falling for the next twenty-odd years, with their lowest quality knives being produced under James Parker's ownership in the late '80s.
The XXs, USAs and early '70s dotted knives were the last I've seen that displayed
consistent fit and finish quality, though things began to come around when River associates, Inc. sold the company to its current owners, Zippo Mfg. Co.
My experience with recent Case knives leads me to believe that they're working hard to put out a decent domestic product for the money, but there's still too much variation in quality for me to feel comfortable about buying sight-unseen, whereas I'll gladly buy a GEC based solely on web photos, and they've never let me down.
YMMV, but one of my major pet peeves about Case concerns a labor-saving shortcut that I find typical of modern Case knives: Boxy handle profiles. In their heyday, Case handles were always deeply rounded; a profile that makes them much more comfortable in the hand and far more pocket-friendly.
Case (heh) in point, here's a modern Case (right) and an old XX from the fifties (left). The modern knives have thinner, flatter handle material slabs and squared edges, while the older knives use a generous slab that's been deeply rounded for better looks and comfort.
They sure don't make 'em like they used to.