Multiplicity

Pros: The UI is pretty. When you need to use the UI, which really only when you need to configure it, it works well for the most part.

Cons: * The thing is very unstable. It seems to have a hard time deciding when it should connect to another machine.
* Often disconnects on the 2nd machine even though in the fancy UI it says it can connect.
* Using the audio broadcast feature, this often disconnects too. Imagine watching a video or something and the audio just randomly cuts out.

The worst of all of this is there is ZERO feedback from the tool. Which is really baffling really. Why wouldn't they have some kind of connection console, some connection log that can be displayed to see the status of the connection?

It is as if they just don't care about the users, just their money. There is little to no support. On their forums people complain about the issues too and it's all "your fault". "Oh must be a problem with your network", etc.

Overall: I use, or rather been trying to use Multiplicity KVM for years. It has constant problems.
All of it appears to be at the network layer. Which is really the most actual important part of the product. Otherwise it's just a fancy UI.
And I have the most simplest setup. Two Windows 10 PCs where I just want to use the same mouse to move from one desktop to the other, and share the keyboard.

A) Takes a long time for the Multiplicity to connect to the 2nd machine when it boots up. Why it doesn't do more frequent polling (or what ever it does to connect) is beyond me.
If you open the app and go through the menus where you can ping the 2nd machine it does and says it can connect..but then it's not actually connected.
B) Randomly disconnects from the second machine.
C) Randomly the audio connection drops.

The worst of it all is there is no feedback at all other than when it gets disconnect it might tell you it's "disconnected" thought a pretty dialog box, but there is no log output or anything.
So either if you are a neophyte or a techy person there is no way to know why it's failing.

This is another bad product where they focus on a pretty bells and whistles UI while the functional core barely works.
They need to get the network layer solid. Offer some sort of console mode log, etc., to actually indicate why it can't connect, why it disconnects, etc., so the user can hopefully fix the issue. Or maybe intentional, they are just trying to hide they don't know what they are doing rather than trying to so solve their network programming.

It works maybe 90% of the time, but then that 10% where it acts random is pure frustration. Have to stop work, reboot the 2nd machine, try to figure why the thing is randomly failing again.
My advice is find something that is more stable.

Pros: Like the brochure says, you can control multiple pcs with one monitor, one keyboard and mouse. I normally have 4 pcs running all at the same time. One for downloading stuff. Another for gaming. 1 for business stuff. And 1 for personal stuff. Before I got Multiplicity, I would have a monitor, a keyboard and a mouse for each PC. Suffice to say, it was a mess. All the wires and connections. Pain.

Cons: The wifi connections break off every now and then. I use Multiplicity with 4 pcs. 2 mini pcs, 1 desktop and 1 laptop. 2 pcs are linked via ethernet. The other 2 wifi. Wifi needs to be relinked via the software every now and then. No big deal since the benefit of only having one monitor, one wired keyboard and one wireless mouse to share amongst 4 pcs is worth the small hassle.

Overall: I've been using Multiplicity for over 5 years now. Need I say more? I like being organized. I don't like clutter. Eliminating 3 sets of monitors, keyboards and mouse is the epitome of being organized. The way I like it. When I travel, it is also less stuff that I need to move around too. Before I got Multiplicity, I needed at least 2 tables to setup my 4 computers. Now, I only need one.