Hey @beckx , welcome to the site and congrats on your first post :)
The Xbox Series X will be backwards compatible with the current Xbox One controllers, so you should in theory be able to pick up some cheap Xbox One controllers as it starts to go end of life. And of course you'll be able to use your exist Xbox One controllers. Equally the Series X controllers will also work with the Xbox One, so in theory you'd expect them to also be compatible with the PC wireless adapter.
Yeah these are pricey and rarely discounted but what do you do? Great for other devices, which I've just bought this bundle for as I don't own an Xbox. Went for the blue colour as need something to standout from all the other controllers I have that insist on connecting to their own consoles first. PS4 I'm looking at you.
I agree but this ain’t much of deal tbh, that’s due to lockdown everyone has probably smashed a few pads (fierce) (:I