The most annoying thing about the 4G Mobile Hotspot is its occasional tendency to go to sleep without warning (as it did with the movies I streamed and with other applications). However, this didn't happen often enough to completely nullify the unit's selling points. The 4G Mobile Hotspot is easy to use, has reasonably good speed, possesses strong battery life, and is pleasingly small and slim. T-Mobile's flexible plan and prepaid usage offerings are the icing on the cake for this capable device.