I'm seeing a lot of mods on this list. I went with the Riva for my first purchase because I have had bad experiences with tube mods (5V Prodigy) and box mods (Carlos' JuiceBox). In the end, I went back to my regular 510 and then analogs. The only reason I came back is because I saw a preview of the tank system used with riva (or ego) batteries, so I thought I would jump on the opportunity to come back. So far, it is definitely still a hassle. As much as I love the flavor, vapor production, and TH with the LR attys, dripping is tedious and messy, especially in the car. Carts never worked well for me in the past, and I'm pretty skeptical about cartos, especially if they aren't LR.
I see these mods, some take away the hassle (box mods, VapeMates and other juice feeders) and some increase performance (VVs and high voltage mods), but I'm still waiting for a device to be the be all end all of e-cigs...high voltage, safe, perfect juice feeding, all day-lasting fog machine.
GIVE IT TO ME!!!!