Brewzilla is the first and only AIO I have used. I no longer need the large 3 kettle systems I had in the past and I like the electric heating. The only thing I do not like is the display down low. I just ordered the parts to make it remote, so I can hang the display on the wall.
I use a AgiiMan 1/2 HP Submersible Sump Pump at the bottom of a large cooler filled with ice water. The pump does double duty in a keg and vessel cleaner I made.