I've been using this keyboard for almost two years now.
After installing the firmware/drivers, when on wireless mode, the keyboard keeps complaining about 1% of battery left, whatever I do. I even installed newer firmware several times, reinstalled the OS and nothing changed. So - I'm left with the wired only.
Also I'd like to point out that the app is undeniably janky.

Great keyboard, super high quality & beautiful sounding blue switches. Love it.

7 keys stopped working after 6 months (they fixed it with the warranty ) and now another 8 keys stop working after 1 year of use.
it's just a waste of money.

The keyboard is very comfortable and sounds great. Its also nice and heavy and just feels very good overall.
Sadly the shipping was a horrible experience. RK gave me a link to a tracking web page where for the past 2 weeks it simply said "We’ve accepted your order, and we’re getting it ready. Come back to this page for updates on your shipment status. ". Eventually they asked me to leave a review for the keyboard I had not yet received, so I had to sent them an email asking where the keyboard is. Only then did I find out that the keyboard had been at the post office for almost two weeks already. What is the point of this tracking web page and the message saying there will be updates on the shipment if it does not actually provide any updates?

Great keyboard but only thing is the stands/feet are wobbly slightly and the keyboard moves/tilts diagonally but overall id definitely recommend this keyboard to anyone looking for something not 100’s of pounds or really cheap and flimsy, this is in the middle of being cheap and expensive but it definitely is not a flimsy low quality keyboard