I used them in the past and thought the service was good. It was spotty in areas, and I eventually moved to an area where they didn't have service at all. But as long as the service is available where you need it they seem to be pretty good value for the money.
Yeah I think I am going to have to jump on the deal.
Not sure which offer I am taking yet, the year free is tempting (1, because I need the hotspot & 2, if it sucks I literally paid next to nothing) but the 15 a month per line is a great offer as well.