Review on 🔀 CKL KVM Switch Dual Monitor DisplayPort 2 Port 4K 60Hz 4:4:4: Ultimate connectivity and seamless control with CKL-622DP by Jayshawn Cuatlayol

I have a 2x2 DP switch. Just started using it and it works great. Reading other reviews and answers gave me the wrong impression of this device before purchasing it. It easily supports up to 4K 60Hz, but I'm under the impression that it can support higher refresh rates at lower resolutions. That is not true. My 4K 60Hz monitor displays very well. My 1440p monitor at 60Hz displays fine (with the occasional flicker which is annoying). The same 1440p monitor at 100, 120 or 144 Hz only showed a black screen - not compatible with a DisplayPort-only 2×2 device. Disappointing and I will be sending it back. Other than that, the other features of the device work as expected, that's all. Again, this was only for a day, so incredulous (I see a bunch of reviews "my switch died in about a month" so link accordingly).