Nice! I had to run my house on my new WGen 11500Tfc this week due to a random power outage on my whole street for a couple of hours.
I was able to monitor my loads with the GearIT Wifi monitor plug. 4-ton AC with soft start, two fridges, and some other random plugged-in stuff (small air compressor, TVs, etc), and I maxed out at ~6,000W usage and typically around 4,800-5,200W with AC on. Right in the wheelhouse of the 12,000/9,500W natural gas output of the generator.
I definitely see the benefits of going with the bigger 14500TFc if I had 1) pool, 2) tankless water heater, 3) multiple AC units such that the run wattage with everything on would exceed 50-60% of the generator's capacity.