Satisfaction or Dissatisfaction with Straight Talk Hotspot

I currently have the Straight Talk 3G unit and it works OK. Not the fastest but for the usage you describe it works. The new 4G model should be quite a bit faster since it's throttled a 5mbs down and 2mbs up. We have been all over the eastern half of the US from Canada to the Keys and always had a connection, except the UP in Michigan but nothing works there.