I have it for 2 months. Overall, it does its job, you can connect 1 VGA monitor and 3 USB devices. Similarly, each computer requires 1 VGA and ONLY 1 USB.
It works as a USB Hub and it is convenient because it only takes up one port on your PC/laptop.
Of course, this also has its negatives. When a mouse, keyboard, and USB stick are connected, everything is fine. However, if you connect something like USB headphones instead of a USB stick, it starts to malfunction. The signals get mixed up and the mouse moves differently, and the headphones don't produce sound.
The second issue has to do with the button. If you press it slightly more than the minimum, it constantly switches between PC1 and PC2, wherever it stops! You have a 50% chance every time you press it!
The other annoying thing about the button is that it defaults to PC1. So, if you shut down both computers and try to open the one in position 2, the KVM opens in position 1. For me, if I don't catch it as soon as I open the laptop in position 2, I have to press it and then restart to get a signal on the screen.
If they had a button like an on/off switch, everything would be perfect