My take is that its an alternative to a Hot spot on your phone, My Internet setup as of now is Verizon. I have hotspot available on my phones and I also have A Verizon Unlimited pre paid MIFI 8800l
I will be going Full time in the spring and my thoughts are that having AT&T thru the Wingard or the TOGO would complement my verizon devices nicely. The AT&T plan is 30.00 a month for unlimited data. From what I have read from folks that have it is that it works very well and they have been happy with it.
It also is a wifi booster so it will increase your range when the wifi signal (like say in a campground) is weak. Its mounted on the roof so elevation helps. And will help all the devices connected to it.
If your signed up for a data plan it also will act as a cell signal booster (not for your cell phone) for the carrier that you have (AT&T in my case). Because of the roof mounted antennas in the unit. And will help all the devices connected to it.
So IMHO it does serve some very useful purposes.