Most Westman/MTS internet plans should be fine. I too am on Lightning 25 and have no issues. I also have a decent router so set up QoS on the Obi device, meaning it gets priority over other traffic, but this is probably not needed.
We plug the Obi device directly into the router, then plug the base phone into the Obi device. Of course this is all in the basement, but it works out well as we have a Panasonic set that works wirelessly with the base, which provides the phones upstairs. There are other ways to do this though.
Just wish voip.ms would get Brandon numbers. I've been bugging them for some time but still no luck. Would be awesome if Brandon became a free calling area for freephoneline but again, might be waiting a while for that
To be honest we use our cell phones mostly, but it's nice to have the "land" line for the kids, and when grandparents are over looking after the kids who don't always have their cell on them.