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I ordered the Sabrent Thunderbolt 4 KVM switch from their website on 30 March 2023:

However, the next day (and every day since then) it showed as “out of stock”. I think I got lucky and must’ve ordered it in the small window between when they added the product page but before they updated it to say “out of stock”.

Anyway, it cost $299 (plus tax), and it was delivered to me on 7 June 2023. So far, so good: I have my 2015 and 2022 MacBook Pros connected to the KVM and I use it to share my Apple Studio Display (which only provides a Thunderbolt connection to the source computer).

It’s the most stable setup for this configuration I’ve tried (and I’ve tried a lot), but it seemed to take a while for the display to initially recognize the sb-tb4k. Also, theres a 5-10 second lag between when I click the switch button and when the display and laptop connect. Regardless, I'm impressed enough with the stability of the connection that I’m going to keep it.

The power adapter for the sb-tb4k KVM is a five-pound brick; pretty ridiculous for how lightweight the switch is. But it also came with plug adapters for different regions. Unfortunately, from my use, the Sabrent sb-tb4k KVM does *not* charge the inactive computer. I’ve tried a few different cables to see if that makes a difference, but so far, no joy. If computer #1 is selected, computer #2 is not charged, and if computer #2 is selected, then computer #1 is not charged.

For some background, my previous setup for the two laptops to share the Apple Studio Display used the KCEVE USB-C switch and some third-party USB-C cables:

There are several offerings for this device on Amazon (and elsewhere) for less than $100.

However, the KCEVE USBB-C connections weren't very tight, so I had to iterate through many different USB-C cables to find a stable configuration. Eventually, I found a set of right-angle USB-C cables from Tripp-Lite that worked pretty well:

I had the right-angle end of the Tripp-Lite cables going into the laptops, the straight-end connecting to the KCEVE switch, then the KCEVE switch's built-in USB-C cable going to the Apple Studio Display, which has its own ports to attach the keyboard and mouse to. This configuration worked pretty well, and the switching lag wasn't too bad, but if anything got jostled, I might get some flicker, so I'd have to make sure all the connections were still tight.

Anyway, now I'm using the Sabrent sb-tb4k KVM as the switch and hub, and still use the Tripp-Lite right-angle cables to connect the laptops to the swtich. The Sabrent setup seems to be a more stable configuration, but the 5-10 second lag in switching on the Sabrent seems longer than the lag with the KCEVE, and the Sabrent swtich costs almost 4 times more than the KCEVE switch.