i just had a dr240w implode on me when a plastic support failed. running neg pressure with a 6" vortex exhausting 2 super sun IIs on a thermostat. was cool for over a month and one morning i came home to my lights on the bottom of the tent still on cooking a plastic tray and some very unhappy plants to say the least... i have 2 dr60s, a dr120 and a hydrohut kindergarden... the dr240w just can't handle the stress over time i think; i mean it's basically 2 120s with shared supports in the middle; still the same thin plastic molded guides. i think i'm going to be buying a home box xxl in the future.