They're advertising it on TV. Two lines for $40 each, all taxes and fees included, with unlimited everything. They'll pay $9.99/month of your Netflix bill. They also have a 55+ program where it's two lines for $30 each ($60 for 2 is the plan), and they pay for Netflix. 55+ means you have to be at least 55 years old. I think it's a great deal.
T-mobile also periodically gives you free stuff on Tuesdays (at the very least they give you something, such as a coupon). They have been cheaper for a decade. I've been with them since 2002. The network is getting stronger and they have no overrages for data. They just slow your data down until the next billing cycle.
