Looking for user feedback on iWireless (Iowa) pre-paid service

Hello Internet,

I'm a current Verizon customer, looking to switch to a GSM carrier (I want a Google-blessed GNex, not this Verizon/Toro silliness). AT&T is just as expensive with poor coverage, and T-mobile has atrocious coverage where I live.

So I started looking at iWireless (http://www.iwireless.com/). They promise good coverage in Iowa, with national coverage supplemented by T-mobile. Does anyone have any experience with iWireless? If so, how is coverage, down/up speeds, Et cetera?

Thanks in advance!