I have been testing Multiplicity for almost 30 days. I had trouble when I first started testing but was helped by the support from the Stardock Forum. I have always used the KVM mode of Multiplicity because the other mode does not work at all.
At first I had trouble with Copy/Paste, then I was able to fix it with help from the Stardock Forum. Now it does not work every time I connect. It is not consistent in other words sometimes it works and sometimes it does not.
I then had problems connecting and using the mouse on the secondary computer. The forum helped me to fix that. Now it is not consistent in other words sometimes it works and sometimes it does not.
My Alienware 17 R3 laptop information copied from the Control Panel System
Edition Windows 10 Pro
Installed on 6/19/2020
OS build 19042.928
Installed RAM 16 gig
I am at the trial version of Multiplicity 3.57.
I have installed and am now using a VNC product that works every time I connect. I have tested it many times over the past two weeks. It has not failed at all. Copy/Paste has worked every time, from Primary to secondary - secondary to primary. It has not failed to connect, primary to secondary, and being able to use the mouse to do functions on the secondary computer.
I am using a home private network. I even tried to use Ethernet cables to connect to the network router, and Multiplicity still failed to Copy/Paste every time and the connection did not let me use the mouse to control the secondary computer from the primary computer.
Over all I am very satisfied with all the Stardock products that I am using and have been using them for many years.
I do not feel confident to purchase Multiplicity and then see if it works. The trial version should work.