Our library has 14 stations at one branch and 6 stations at another branch using Libdata to manage authentication and printing, but I don't see any reason why it would not be able to grow exponentially. We use a Jamex coin op connected to an HP color laser printer at each branch, and all prints are 15 cents, regardless of color content. We have a Windows 8/10 computer connected to the network and used as the release station and we added a barcode scanner so patrons can scan their barcode to get to their print jobs. You can also release print jobs from the admin interface and keep a printer behind a desk and take money that way. Each location has to have its own Control Center installed, so you can connect to your local Cloud printer, etc. I can still see and interact with both Control Centers from any computer on the network from the IP address.
As far as issues, maybe once a year a problem might develop from a Chrome update, but Charles at Libdata usually has it fixed within a day or two, and you aren't necessarily down during that time there might be a feature missing or something. There are some ongoing issues, like the default oif A4 paper, which is not a problem if you are in Canada or something, LOL. There are pluses and minuses in using a computer already in use for Control Center, and if things get wonky a quick restart of a background service usually sets things right no need to restart the whole machine, but if you do the currently logged in people are still working it does not boot them off.
It's not perfect but it works most of the time, which is not easy to say in libraries about everything else. The hardest part was learning the Google Admin console and figuring out licenses and settings to make all the different parts work, like OPACs and promo screens. Our OPACs just would not stay "on" and the monitors would sleep so quickly, but nothing done locally would fix it, until I saw a setting while configuring the promo screens that looked like it would keep the OPACs awake, and it worked!
I tried to do a presentation at our state conference but no one seemed really interested. I should have done the math for them, it is cheaper and uses less energy, plus I love the Chromebase that uses only one plug, and looks a whole lot cleaner in the carrels. Maybe I'll try again.
Michelle