Two years ago, I bought a Cougar PURI TKL with Cherry Red caps.
The keyboard was inexpensive, but reviews on it were very good and it appeared to be well built.
However, after a year of light use, the bottom row of keys failed and would not register keypresses. The rest of the keyboard was fine.
Of course the failure occurred just weeks after the warranty expired. Quite disappointed wrote to the company to request a repair. To their credit, they offered to replace the keyboard, but I would have to pay shipping costs from Canada to the USA. A quick calculation revealed the costs would exceed the price I paid for the keyboard. I gave up and am now selling the keyboard for parts.
The lesson I learnt: I no longer both with modern mechanical keyboards and rely exclusively now on an 1983 IBM Model F XT with Soarer's converter. It will likely never fail.
With new mechanical keyboards, the switches may last for decades, as well as the keycaps and case. But the control boards can be of questionable quality (like Cougar's boards) and fail quite easily. I posted a review on Amazon about its non-longevity
https://www.amazon.com/gp/customer-revi ... dctrvw_srp)
I took the Cougar PURI to a local electronics repair shop, showed him the problem, and he advised selling it for parts.
I particularly liked the PURI TKL, but it was not up to a simple task: Not breaking and providing years of reasonable service.