After a great deal of investigation I just purchased a Zenisis Altus. I can't wait for it to arrive. I love the fact that Zen has developed a new thread standard to get away from the 510 connector that is less than ideal for the more advanced devices. The quality appears to be top of the line. I would also love to obtain a ZNA but I don't know the ropes enough to get one soon but Zen promises that his devices will have a long run and eventually everyone that wants one will eventually be able to obtain one. Mostly I like the modularity of his line which assures that you don't waste your money on something that will be obsolete in a month.