I picked one of these up as an upgrade to the NPRO, which gave off a good vapor, but one of those carts was the equivalent of 3 cigarettes. The DSE901 is a finicky one... got two atomizers in my kit, one of which would only burn but not give any vapor without the burning plastic taste, and the second one when being inhaled a little too frequently, would also burn. It's ok after a cooloff period of 2-3 minutes though. I am certain the first burning atomizer is definitely a defect, as I tried to smoke through it but it would not get any better. The second one, I am not so sure. Is this just a normal characteristic of the DSE901 in general, or do I have a defective kit? The NPRO would heat up, but never gave off this plasticky taste that I experienced with the DSE901.