The adapter we have today does just that; you can drive two 4K monitors at 30Hz from any Windows based computer with Thunderbolt 3.
This has a huge benefit to laptop users allowing you to switch from a small monitor to a multi 4K monitor setup with ease. The need for these types of adaptors will no doubt boom in coming years, as you can ditch your bulky desktop in favour of a laptop that can fulfil both duties.
Unfortunately, this is Windows only, but set up is quite simple. You just plug it in and go for most cases. Some reports I have read online require you to update the drivers, but I was able to get it to work immediately.
Startech also has some compatibility information as not all laptops, or motherboards can run both screens concurrently.
If you don’t have 4K monitors, that is fine; it is completely backwards compatible with lower resolutions such as 1080p.
Overall I am quite pleased with the Thunderbolt adaptor. It does what it says on the tin with no issues. Build quality is excellent, and it is not too bulky or ugly.
The RRP is £150, but you can currently get it on Amazon for less than £93 . While this seems quite expensive, it is negligible compared to the cost of 2 monitors, or owning two separate PCs.