I was very skeptical because it was the cheapest cell phone extender system out there, and even more so since I didn't have access to a window at my desk cubicle, but heck, I thought any service is better than none,

From hardly able to send a text to reliable service

Excellent customer service.

When testing with the app "Network Signal Info Pro" initially in a good service area I didn't notice much of a change

Did not really boost my service

When you have a little service it will improve the service but won't do much where you don't have any service.

Works as described, took on trip into sketchy service areas and gained 1 to 2 bars consistently.