I've only had the 306 for a few days. I'm definitely enjoying the warmer vapor, and the bigger clouds from shorter drags. I've noticed a lot of juices actually seem to have a stronger flavor on the 306, contrary to what I'd heard in the past...but I haven't vaped any particularly delicate flavors on it. On the 306 there seems to be less room between flooded and too dry than there is on the 510, which i guess is what i'm talking about when I say the 510 is more forgiving. If I'm not paying attention and an extra drop goes in the 510 or if i re-drip sooner than needed, its generally not an issue. Maybe the first puff will be less than ideal. The 306 is not so forgiving. That being said, I've had limited experience with it so far, and i'm sure it will quickly become second nature. Also, after a day or day and a half of using it, it seemed to be getting more forgiving as it got a little broken in. I dunno. All i know is that the cisco 306 kicks like a mule, and the cisco 510 hits like a champ.