@dundurs: There is a new firmware available with a much improved response time, it is now around 1-2 frames, worst-case 4 frames, so less than 160ms. (BTW this was tested with a decent access point, but with a fairly old standard laptop)
No need to worry about flooding the system, you can safely use 10 or more tally units without any problems. They not only talk to the switcher, they also communicate with each other. As it is now, there are only 2 units connecting directly with the mixer, the other units will listen to these "master" units. So at the current configuration, you will maybe get 10 requests a second max, regardless of the amount of tally lights used.
I will check with the developers from vMix to see what other changes can be made. The built-in phone-tally works slightly different than the current setup for Cuebi, but this is because the working of the vMix API is not the same as phone-tally uses.
So as it is now, it works well, and since the firmware can be upgraded easily, we will be working with vMix and the people on this forum into improving and adding features in the future.
@iceStream: From the start the system has been developed to be ease to use. We do not sell the access point with the set, so you are indeed required to create a normal wireless network. But once the access point is configured, and the Cuebi Lights are configured, there really is nothing else to do, and it will run this time just as well as the next. Not sure why you think you need to set WPA2 security each time, can you explain?
The Cuebi Lights are easier to use than the phone-tally:
To use the phone-tally, you need to connect your phone to the WiFi network of the vMix switcher, go to the IP address and select an input. You have to do this every time you want to use it.
For the Cuebi Lights, you use the provided setup utility to set the WiFi network, IP address and input. You do this once, and from then on, all you need to do is turn them on.
Not to mention the fact that a set of 4 is cheaper then 4 phones, the units are a lot smaller and lighter than a phone, and they can be used as a system-component to trigger other LEDs. You won't fit a phone inside your eyepiece, so your handheld operators will be happy:)
You are right, the vMix and ATEM protocol are completely different and there are really no similarities between the two. So they each have gotten their own implementation which will both be maintained actively.
Hope this has taken away any of the doubts that you have.