I haven't noticed any issues here in TX. I do not use them for internet, that isn't an option where I live. I did notice that when I was in New Iberia earlier that the signal strength in town was OK but not great. The data speed (4G) was almost down to 56k dial up. A mere 15 miles farther south a speed test was dramatically faster.
I live in a cell dead zone, cut off from the towers by hills so I have to use landline internet by windstream. More like clogged toilet than a stream but the verizon signal booster will only work with a landline internet connection. None of the other cell providers can produce a signal at my home so I am kind of stuck.