I guess no definite answer here. I have bought in B618 lately after reading about its performance. But when I do speed test comparing my existing MiFi and B618, I can more or less say that B618 does not outperform my existing MiFi all the times, and there are occasions where the existing MiFi has performed significantly better than B618. The one thing that almost consistent is the upload speed of B618 is most of the times better than my existing MiFi. That's all I can say. So if you really want to upgrade, can consider borrowing B618 from any friend (if available) to test out before making the decision. Just my two cents.