Some people don't have the funds to simply go out and buy a new ballast. Also not everybody has central air or a/c in their house. My house, for instance gets way too hot in the summer for a 600. Luckily I still have my old 400 and it sure saves a few uncomfortable degrees in the grow room come the warmer months. I agree with you that the D-A-W system may be a bit 'unpolished' but in years to come this feature should save a ton of people lots of money.