I finally caved and eBay'd some Coffee Instant Type 2, and let me tell you, Steve1989 did not exaggerate.
I'm not a fancy coffee person or a gourmet or supertaster or anything, but yeah, it's nice. Kind of a round, mellow flavor, not acidic or with that nasty stranded-in-a-waiting-room bitterness. It's an instant coffee that did not make me regret having to drink it.
The powder is a lot finer; I made the mistake of opening it over the steaming mug once and it clumped immediately, but dissolved again with stirring.
That texture might be the drawback, though. I hoard a fistful of instant coffee sachets in the back of the cupboard in case of power failure or baking, so I don't think I'd use bulk spray-dried coffee often enough before it solidified in the jar like a pu-erh cake.