A little slow for the connection and the firmware is rustic (mobile is a good complement ...).
3G, 3G + and 4G speeds quite honorable, it happens to compete with an ADSL line (+ 3G + 16Mb, 40Mb of + 4G for tests that I could do).
It heats much on 3G and I had to pick up the plastic front side where the cheap ...
However, I use it everyday with multiple computers and it's going well!