I added the Delta VoiceIQ module to an existing Brizio touch faucet. Very easy installation and set up with Alexa. Dispenser amounts are close, but not exact (if you are OCD like me). That's easy to correct when you are defining pre-named objects, like a coffee pot. You can simply tweak the the amount you set so that the output is exact. Dispensed amounts seem to be relatively independent of flow rate, but also seem most accurate at high flow rates.

I do wish the voice commands were direct Alexa commands and not an Alexa skill. For example, it would be much more convenient to say, "Alexa, fill the coffee pot," instead of, "Alexa, ask Delta to fill the coffee pot."

Voice control faucets won't be truly usable until everything including flow rate and temperature can be controlled by voice. I'm sure that will come someday, but until then the Delta VoiceIQ is the next best thing.