Been with Sprint forever, around 16 years, I think. The service is adequate for where I need to work. Prices are about the same as others, except I get 40GB of data out of my 20GB plan! I only use about 10-15 max most of the time, though. It's something like $100 a month minus the 20% discount, plus $15 for each line. They ONLY discount the plan, not the $15 for each line, or the phones. So, I don't think they would be any cheaper for you, even with their new plans.
BTW... Beware of "Unlimited" plans! Sprint clearly states that video streaming, and certain other content is knocked down to a lower quality with their new plans.