15 gallon vs. 60 gallon fermenter 75.00 or 121.00

I just found this fermentor and there are quite a few using it, Is it crazy to go 60 gallons or should I keep it at 15? what are the disadvantages of the 60 gallon? I dont think I could brew 60 gallons in a day, but I know there are partial boil methods that some use! http://www.plastic-mart.com/product/5815/60-gallon-cone-inductor-tank-fully-draining-infd60-24

 

The issue I see with it is that you would have a massive head space at 60 gallons, even if you brewed a 1/2BBL or a full BBL. I may look in to getting a 15 gallon fermenter from them.