I love the RD too, and the e-cig version (E9). I've been using it for 2 months, and I pretty much chain-vape all day at home, work, and in the car. I've had a Janty KISSBOX for a little longer, and also an NJOY NPRO, Vapor King, and a DSE-901. The RD produces better vapor than all the others mentioned, and it is reliable and consistent.
The KISSBOX, is nice when it works, but I've gone through 7 atomizers, and it was out of commission for nearly a month due to unresponsiveness on multiple emails to JantyUSA. Finally got it working today after receiving replacements, and I like being able to refill the carts easily and save bucks, but I really love the RD... very simple and never an atomizer to worry about. The carts do get expensive... you have to buy them in bulk to save. I don't care at all for the carts from Red Dragon or e-cig that come 4 in a pack. The material that holds the e-liquid looks like wound up paper and tastes like it too. Newer Carts from other suppliers (like Smoke51) come 5 in a pack and using a batting instead of paper. Tastes much better.
Having only been vaping for 3 months, and having only owned 5 different models, I suppose I'm still a newB, but I'm telling you the Red Dragon or the same things: Bloog, Magnum EAZE, Smoke 51, Loong Totem V9 or e-cig E9) are a favorite of mine. There is no muss, no fuss, and it is consistent and tastes great (with the right carts).
With a USB passthrough from e-cig (the U9), you can vape all day and never worry about a battery. I have two of these "hookahs" and they work great.