We have cable internet with our phone bundled into that. One of the reasons we did this was the cost of the line rental. We pay $79 a month with 7gig of internet, local & national calls & calls to carrier.
We had to sign on for 24 months and then got everything free. We were able to change our plan down, we started at $99 month, after 3 months. We are now over the 24 month period and get the new deals without having to resign.

Friends have their phone through their internet which they really like.
It depends on how much you will use the phone to offset the cost of a stand alone line.