I own quite a few older Case knives, but only a dozen or so modern ones. The XXs ('40s through the early '60s), USAs (mid to late '60s) and early '70s dotted knives were the last I've seen that displayed a high level of consistent fit and finish quality. IMO, the quality began to drop in the late-'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.
Things began to come around again 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 a reasonable price, but there's still a little too much variation in quality for me to feel completely comfortable about buying them sight-unseen.
The annual Case/Bose Collaboration series are basically "mid-tech" (semi-custom) in terms of design, materials and F&F. They're quite a bit more expensive than the company's standard fair, but they're probably the highest quality traditional production knives available, though the occasional lemon still slips through QC. Case's customer service is exemplary, so if you have a problem, they'll make it right in short order.