"MiFi mobile broadband provides standard 3G connection speeds of up to 21Mb, depending on location. "
yeah right, of course it does !
see those two phrase "up to" and "depending on location"
3g is slow, 4g for most people in most locations is rubbish so to make Mifi useable at decent speeds is a big leap of the imagination.
I wonder how much more its slowed in multi user situations
The way things are going it will be 5g and upwarsd or whatever new fangled tech is on the way before systems like this are really "useable"