When it comes to durability and reliability I believe magnetic still rains supreme, why do you think most commercial, industrial, warehouse & security lights use magnetic ballasts, they last for YEARS!!!! From what I hear Lumatek makes the best electronic ballasts, however Ive heard on several occasions that electronic/digital ballasts produce RF (Radio Frequencies) that can cause problems with peoples cable/internet and possibly other equipment, apparently a few people have had some close calls with the cable guy tracing the problem to their grow rooms, I wonder how many plants have been pulled and grow rooms torn down because of this?? Apparently the RF problems can be prevented by putting your ballast in a faraday cage, however Ive heard that some ballasts now come with RF shielding. If I had to choose between magnetic & electronic, right now I would hands down choose magnetic, not only are they more durable & reliable but they can run CMH/CDM (I know there are digital ballasts that can run CMH but their too expensive ATM) which are hands down the best HID bulbs for growing.