We're actually not waiting for a "repair" but instead a "replacement," apparently. Yamaha is waiting for a fresh batch of keyboards to be made and reach the US, so they can send us one...
My son recently turned 12. He's a very casual keyboard user. He has been using a Casio SA-76 toy keyboard daily for years, mostly just playing with it and having fun. He has learned several theme songs to various TV shows and movies that he likes (Top Gun is the latest example). He watches YouTube videos that teach him how to play these songs.
His biggest frustration with the SA-76 was "too few keys," because some of the songs he's trying to learn require more octaves. Sound quality wasn't something that he complained about, hilariously.
Once he got his hands on the 473, he definitely enjoyed the better sound quality, and really liked exploring the 800+ voices that are on there. He was also starting to mess with the drum kits. And the accompaniments were wowing him a bit. And he had just discovered the arpeggios too. He was also appreciating touch sensitivity, and the pitch-bend wheel was fun. And he was twiddling the knobs, too. And using the sustain pedal. These are all things that were missing from the toy SA-76. The 473 has that "wow" factor.
All that said, he's an absolute beginner, and just a kid. He's not going to dive deep into the manual, and explore all the customizationa that are possible. He was able to figure out all kinds of things on the 473 just by exploring and messing around.
WHICH makes me worry about getting him anything more complicated than the 473. Those "workstation" type keyboards have a full-color screen with loads of deep menus, etc.
I did look at the CT-X5000 pretty closely.... but the UI is supposed to be a "nightmare" of confusing complexity. Jeremy See literally used the word "nightmare" in his comparison video
That said, the CT-X5000 is a much more powerful keyboard, with more features (like portamento, recorded track editing, etc.) But I don't think he needs that stuff just yet.... ESPECIALLY if the trade-off is that it feels complicated and confusing,
The other one I've looked at is the Korg EK-50.... even SIMPLER to use than the 473, with a better build quality. The only hesitation for me there is the lack of arpeggios.... those are SO MUCH FUN, especially for a beginner who just wants to mess around.
My main problem when doing research before buying was that I couldn't see either the Casio keyboard nor the Korg keyboard anywhere in person. Most local keyboard shops sell Yamaha.
So it's really hard to just read reviews.... seeing/feeling/hearing/using a keyboard in person tells me a lot. Like, maybe the CT-X5000 isn't that complicated for basic functions... but I'd have to fiddle with it myself to decide that.
I was able to play a 473 in person before buying.... and it felt like the perfect fit for my 12-y-o dabbling son.
I just wish I had bought the Floor Model with the working screen!