This thread comes just on purpose. I was just a about to order one of them for my starting nano and even thought to order one on my 60gal to replace the AM1000.
I found an Australian forum where this new device by UP is discussed. Buyers say that at 3bps it will result in a hazy aspect filled with CO2 microbubbles. All feedback talk about a dropchecker moving from lime-green to yellow with this device and that they had to crank down the CO2 compared to an inline reactor or even a glass diffuser. The device can be cleaned with bleach and can't be unassembled. This leads to support the use of a ceramic device maybe between water and CO2.
So, based on your expierience, do you think it can give good CO2 control? UP also builds inline reactors suited for nano that are very cheap. SO I'm really hesitating. Could buy both and give them a try...