I need to locate a monitor in a kitchen and have access to mouse as well (so client can pick any camera full screen, etc).
I've found some KVM extenders with USB on Amazon ranging from $100.00 to $200.00.
Have any of you done this? If so, what'd you use ? How were the results?

Worked with a Google Meet setup recently and found a need for an HDBaseT unit that had USB- only found some B brands but we haven’t made a decision yet on a solution. Curious if any have been used successfully.

I don't get why you'd want to complicate it. Pretty much every NVR comes with an IR remote. Every remote I've used had the ability to press a number button to pull up that camera. If they have over 9 cameras I can see it getting tricky. The remotes also allowed you to cycle between single cam, quad, 9 channels and sometimes 16 cam view.

Exactly. Why would you put a mouse in? Ir extender should be all it needs.

I installed (3) dahua 16 channel nvr’s in a local hardware store. This equipment was installed in a rack with the rest of the stores systems. I connected these to a monoprice HDMI kvm and cat5e USB extender that they used to manage the servers from the managers office. I’ve never had any issues during config/setup or during maintenance either. With dahua for playback and or settings a mouse is preferred over a remote.

I've been using these USB extenders at my own home for a few years for the same purpose.

[Link: amazon.com]

The video is already distributed through my matrix so I justed need NVR contol in my office,Mbr, and shop.

Zero issues so far and I'm pushing the distance to the the shop at 144ft.

That's beyond my comfort level for something rated for 150ft!

These guys work great. Many flavors to choose

[Link: hallresearch.com]

1) Why would you put in (3) 16 channel NVRs? WTF! You get more complications, no unified searching or archiving, notifications, storage management issues, etc... A single 48 channel NVR appliance (w/RAID), with a 48 port POE switch, would have been a LOT better solution. And probably not cost much more.

2) With the NVR(s) on the network, their is software to manage the NVR(s) locally from their office (that give even more functionality than the direct view menu in many cases these days). They didn't need the KVM switch, all the extra black boxes, dedicated lines, and mess/trouble that 'could' popup from that.

Unless this was a system you did 15+ years ago, I do not agree with your design at all.

(1) The NVR’s were installed individually over the last couple years, not my customers but a good friends. I was called in to do an overnight to clean up the comms room installing a proper rack etc this year when I noticed the the USB extender and HDMI cable that ran to the owners office.

(2) Yes I’m well aware that there’s software available for a single user interface among multiple NVR’s, that’s why I didn’t walk about the design originally. A computer to run the software is on his roadmap for future upgrades. His I.T. Guy installed the kvm for local access to the corporate server and some other desktop that’s installed in the same room for security reasons. It had spare ports so the NVR’s were connected.

As I said previously, this isn’t my customer, I went in 5 years ago to a mess to help a friend upgrade a garbage surveillance system. Went from 7 analog to 16 IP. Didn’t think I’d ever go back, didn’t want to. Comms room was a mess. A year later I get a call he wants 16 more but that’s it. No money for rack or cleanup either. Fine, whatever. It repeated for a third time and then I put my foot down. No more until we deal with the room, that was this summer.

The customers budget is as pleasant as your attitude has been from all your assumptions.  I’ve never uploaded pictures but I do have a before and after from this summer on the cleanup.  As I’ve said it’s been about 5 years but after his clean up the customer is finally starting to come around and see that he’s on the right track now.  I never thought it would get this far so I’m quite pleased.  Sorry the pictures would add some contrast to the post.

Yes, my attitude has a lot to be desired :)
Like you, dealing with stupid things all day makes for ranting a bit with posts. But I do try and provide context with the rants. It sounds like you already have a handle on it however. Good luck with pushing them to get things done right.

With such clients, I always point out any problems they have with the system, towards the mess they have. And point out it is costing them more time & material to deal with the mess. The longer they wait to fix everything, the more money it is costing them - they eventually could have paid to fix/upgrade everything but they still have the same crap setup.

While this IS true, it is a MAJOR pita to use a remote to access recordings, do searches, export files, etc. A mouse is a thousand times easier to use. That said, if they just want to flip thru cams, then YES, use the remote. Most of our NVRs are set up thru moip or matrix and control is on the remote. Customers do love that of course. But certainly not for anything more than viewing. At that point, its even better just logging into the NVR from any PC than using the mouse from the extended monitor.

When are the "State Of The Art" camera systems going to have the same functionality as products like Nest & Ring? 

It's gonna be so exciting when the State of The Art systems catch up to the crappy DIY products.

My point:  If for example, an integrator was using a Nest Cam, he wouldn't be dealing with this situation.  He'd download an app on their TV and be done with it.

These companies are falling so far behind that they'll all be gone in a few years.

OP didn't ask for remote viewing of recordings. Just bringing up full page image.

Well, no, not "just" as he added "etc". Thus, comments warranted.

They do already. It’s called Synology Surveillance Station.