Pros: I've used Sprint for 8 years and have had no problems.
Cons: The first time at their store, wondering why I was not being waited on, I finally realized a computer was there to greet you and you were to type your name in to be "put in line" for a CSR.
Summary: I've always reached an informed, English speaking CSR. I rarely have dropped calls or go into "roam" (except at Target for some reason, but not during several road trips from FL to OH). FYI: I've changed my plan several times (usually adding more minutes) and every time I do, the 2-yr. contract is renewed from that point on. I share with my 16-year-old who normally has over 1,000 text messages and 500 calls a month. I added $15 for unlimited texting (vs. $.15 per message) to her phone and a $7 warranty, as she has broken several phones. When her phone was stolen in January, I made a phone call and a new (refurbished) phone arrived within days. One time the store promised I would not be charged a $36 activation fee. When it showed up on my bill and I called to complain, the CSR sent me a text message telling me how to get out of paying the $36. (He said he couldn't "tell" me this on the phone - wild, huh? He probably doesn't work there anymore!)
I found this website by Googling Sprint and "Fair and Flexible" as I suspected it was cancelled and my contract will be up in a few months. If I have to go back to "guessing" how many minutes we'll be using per month, I may end up changing carriers as our minute situation seems to change from month to month and I refuse to pay $45 vs. $5 for 100 more minutes. (P.S.: I started [in 1999] with one phone w/60 minutes at about $30/month. This last bill [04/07] was $134. w/2 phones: 926 anytime min., 894 nite/wkend min., 348 Sprint to Sprint min., $15 for daughter's text messages, $7 for her warranty, $5 for anytime minutes starting at 7:00 p.m.; $4.20 for my text messaging, and $1.79 for a 411 call. [Hope this helps.])