@WildBill
I think it all depends on how you choose to use the fan. I control the temperature/humidity of the whole room rather than just the tents so it's vanity for me to get the AC infinity plus they are quieter.
For someone that puts heaters, humidifiers, etc in their tents it would prove more beneficial because of the probes. The fan regulates speed based on set parameters so you aren't exhausting all your built to humidity or heat too quickly or if you need it done quickly then that's an option too.
The 4 inch I was able to test was as good as what I could do with InkBird controllers but it is more efficient for me to control outside temp/humidity - 72f/50-60% RH - than wasting money to control a tiny space that has its air replaced frequently. It seems backwards, it goes into your bedroom and then back into your tent to some degree - might as well let the intake air be in constant range with grow lights adding the extra heat.