I have been using Z3X box for almost two years. Before discovering Z3X, I was stuck with the incomplete boxes out there. I really like Z3X for the following reasons :
-the Z3X team is always the first in the world to release solutions for new models
-the Z3X box is activation based, that means that once you pay the one time activation fee you can use the service forever.
You don't need to buy any credits like with the competitors who even don't have such a great service.
Now that I have Z3X box, I cab fulfill my customers orders faster than with any other box and the box is crazy fast.
Another great thing is that the Z3X team recently included a feature that allows you to root Android devices directly without the hassle of looking for tutorials.
In one word, Z3X is the best.