You shouldn't be disappointed... I've had Sprint for over 10 years now in Western Washington and travel all over the state. Over the years they have absorbed the old Qwest Wireless CDMA network, and have changed all the Nextel sites to synergy (CDMA/IDEN hybrids) in all the places it makes sense.
Because of this, I can put Sprint's coverage up against Verizon in many areas--and since there are two roaming partners in many parts of the state (Verizon and US Cellular), the roaming options are second to none.
Washington and Oregon are some of the better areas in Sprint's network. I guess I've been spoiled--I also travel to Iowa often, which is in an area that has gotten little to no Sprint love over the years (it was mostly affiliate territory that was never upgraded to 1x and tower spacing that is meant for 800), and I can understand why people bash them. The network there is HORRIBLE--it's a night and day difference. They have the same roaming options (Verizon and USCC) so that and the force roam app makes it bearable. Go across the border to Minnesota however, and you're immediately back in corporate territory with lots of Nextel synergy, and the absorbed Qwest network, just like in Washington--and it's really good again.
All in all, you should be good in Washington--if you happen to be in a dead area, that's what the trial time if for
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Unless if you could qualify for a 25% discount, EPRP is $69.99/mo. + taxes/fees vs Boost or Virgin Mobile. I think the Taxes/Fees for the State of WA. would be roughly 23% or $16.00.
Unfortunately, Boost and Virgin do not roam--you have to make due with native Sprint coverage. I was speaking along the lines of contract (since that is what I have).
On the plus side, you will pick up the benefits they have made to their native coverage.