I am loving the tank system. I actually bought a clone of the Ego when I first started vaping (T-Rex) from esmokeronline.com for $30, same price for that kit as for the Riva. I think the Riva is the better of the two though. After I had that for a bit though, I bought the tank atomizer, and 5 tank carts from Liberty Flights, it was $22 shipped. The day I received it, my wife and I fell in love with them, so I ordered two Joye Ego-Tank kits from iVape.net. They have a great price, they are $59.99, for that price you do get genuine Joye parts, and two ov everything. Two batteries, two tank attys and 10 tank carts.
Now I already had something like10 regular 510 attys, so if I wanted to use those I already had them too, but if you were thinking about the tank system, thought I would let you know about that deal. I also bought a Joye ego passthrough when I ordered it, and am loving every aspect of the purchase. I love the tank system