I started with a Torchmate 2x2 a little over 3 years ago and in less than a year I upgraded all the way to the 4x4 growth series and added the AVHC and a quality refrigerated air dryer. I went from 2x2 to 2x4 to 4x4 and then added the AVHC shortly after going to 4x4. Best money I've ever...