I live WAY out in the sticks.
I had a MiFi 2200 and the only place in my house that it would receive a 1x signal (-115 dB) was in the top of a window. After almost 2 years the sun baked it into a puddle. I upgraded to a MiFi4510L and got a MUCH better signal (-90 to -95 db).
I now have a steady 1 Mbps down vs. the 100 k with the 2200.
The only problem I am having is that my droid 2G will not connect unless another computer is keeping it out of the "dormant" state. As soon as it goes dormant the droid can not connect to the internet, and sometime can't even get to the admin page.
I've scrolled the forums and locked the MiFi4510L in b+g mode, and 3G mode. It is powered at all times.