It will be too late for me.
I'm 10 months into a 12Gb/12Month dongle from Three, and have finally decided I'm not getting another one.
Occasional reduced speed I can cope with, but not the continual tendency to drop out completely for usually a couple of minutes at a time but sometimes a lot longer, no matter how "strong" the dongle is reporting the signal to be.
It worked fine for 6 months, but now its trash and at times completely unusable even with a full five bars of signal showing.
Clearly, its not the "last mile" that's having problems, they've just sold too many dongles leaving grossly inadequate capacity in the "wired" part of the network beyond the local mast.