Some of those Sanyo wall-mount units look suspiciously like the Goodman unit we've got right now. I wonder if they're the same thing rebadged?

Doubtful, unless Sanyo has moved its manufacturing to Texas. Maybe an issue of who copied whose design? I've seen a lot of those Sanyos since, many as retrofitted AC in small hotels in Europe, also in a lot of the newer bottom-tier US hotels like Candlewoods. Inexpensive to install (built-in thermostats, infrared remote control, minimal wiring) and the ones I have met worked well for what they are.

Interesting, that Goodman page seems to say they own and/or manufacture Amana. Amana *used* to be the grand, gold standard for appliances. Not a market I pay much attention to. Have they slid?