Anyone tried to use it with an external powered USB hub?
Of course, a lot of people use it as a "backup" line, which is correct. Only when "shit happens" (for example, a dog started to make a hole in the ground to hide the bone, and hit the fibre under ground, and bit the cable to pieces).....
So now in stead of 250 Mbit, you bow have a "poor" 5 Mbit over LTE (do not forget, that all other people in the neighbourhood also will fall back to LTE, since the fibre provided connectivity to the entire city area).
And THAT is the case, when a lot of data will be transferred over the LTE stick, and then it disconnects. Exactly (!) at the time when you really need it.