So just to be clear, I own 14 x 1000 magnetic ballasts and recently have been buying any 1000 watt nextgens I can get my hands on.... Out here in Cali, people sell used 1000 watt nextgens on Craigslist for around $150. Allthough I do run my ballasts outside my rooms, they run so much cooler its Frikken amazing. As for energy savings.... Come on people, 1000watts is 1000watts no matter how u plug it in. Also, the cooling fans blow outward, meaning they don't suck dust into them.
Bottom line is I can get brand new in the box magnetic switchable ballasts for $90, or a perfectly good used $150 digital setup, for just a little bit more money up front, you will have a better result, colder room, more lumens, happier plants, better footprint, nicer nugs..... I can keep going!
GiGO= garbage in - garbage out, and NITS = nextgen is the SHIT!!