I got one about a month ago. I had signed up for email notification about five months ago, but never saw the notification (not sure if not sent, or if it simply got trapped by my spam filter). Anyway, I paid the $150 and am not paying the $20/month because I don't make oodles of calls at home. I have gone from 0-2 bars in the house to a steady 4 bars. I have had to reset it twice thus far (hit the recessed button with a paper clip). It's about 4 feet from a window, and after a very slow initial setup (1.5 hours?) it now resets in about 5 minutes.
I know that some people object to these on principle, because it means we pay more to overcome AT&T's shortcomings. In my case, the ability to get a strong signal in my house overrode this principle.