I also prefer MiFi devices to USB sticks as they work with anything that has WiFi (including iPads, phones, etc) and you don't need to install drivers.
They're great until you go somewhere that has WiFi congestion problems, e.g. in a city, or a hotel. None of the MiFi devices yet seem to support 5GHz which would help a bit.
I see double performance from using my EE data SIM in my iPad than having it in a MiFi device :-/
James -
plusnet unlimited fibre - 2 Jun 14 - 470m - 80/20 - Summer/dry sync 55/9.4, Winter/wet sync 52/9.1
15 years broadband (1999 ntl:cable trial) - Asus RT-AC68U with HG612 - BQM - Summer PN speed - Winter PN speed