Summarized? It's a wonderful app that allows you to change your carrier region to Verizon/TMobile and allows you to download apps from other regions, not just US. All it does is change your regional code via root and ofcourse it's reversible.
As of lately it doesn't work, can anyone report the same, happened to all of my Nexus devices. GNexus, 4, 7
Google Play 3.10.10
My view is probably Google Play Services get's updated on it's own and killed it. Anyone found an alternate fix?