I also love the Kanger Protank, but it does not always want to fire on my MVP. First time it didn't fire was because the base was coming apart. I got new bases (which is tricky to do as they are always sold out). Then still with a new base, it decides when it wants to fire. The iClear 30s, which always fire for me, have way too tight of draw for me which is why I don't like them. I feel like I am sucking on a straw trying to get the last little bit of liquid in a cup when I use the iClear 30s. I used to love cartos but the process of filling them and the leaking got to be too much and even those sometimes have problems firing on the MVP. I got an eVod and it works amazingly on my MVP. It always fires and I love the bottom coil cleros. I found I love the bottom coil clearos better than the cartos, however, the thing is the eVod is just too small of a tank. I think the reason it works so well on the MVP is because of the base of it. It has the 510 threading with a built-in cap that seems to secure the base around the threading better than the vanity caps. I am looking for a larger tank like the eVod that will fire consistently on my MVP. Suggestions welcomed!