SVD is the best ever! For $100 you get the device, two itaste 3.0's clearo's and 3 refills! Awesome dual coil tanks clearo's, they are! Also, the SVD is built like a tank, all stainless steel! You can vape any 501 AND authentic ego threaded carts! Simply remove (or not) the ring. I've screwed on my ego carts without removing the ring, because it (the ring) is set on its own threads! I've researched the Evic too, but it seemed weak in comparison, nice though. But I went with the SVD, almost got the MVP, but the MVP doesn't have the watts, but the MVP does have the pass-thru capabilities, but I got the SVD because of the wattage feature, and with 18650 batts, you can vape for about 2-3 days, chain vaping too! The wattage is awesome! You simply choose your wattage, and from that point on, any ohm cart you use, it'll vape at your perfect wattage set, so the ohms don't matter so much anymore, that's my understanding of it. However, you may adjust anyway, to find your sweet spot for each cart. My vote is for the SVD, hands down, especially on the great deal they are. In my opinion, your only paying about $70 for the SVD, with all the accessories you get free!