Another review, expressing much the same evaluation I've come to:

Republic Wireless Moto X Review: A Great Deal With Very Few Compromises

Republic Wireless offers a great value with its service. Even though you're not using the cell network as much, you really don't notice. Virtually all of the WiFi features are completely integrated into the experience you're already used to, so it's easy to forget that the phone is using WiFi data instead of a cellular voice connection. With the overall smoothness of Republic Wireless handovers, I don't think you have anything to worry about on that front.

This phone is also a huge step up for anyone considering going with Republic. Before the Moto X, the only device available was the Motorola Defy XT – not exactly a crowd pleaser. The pricing is hard to pass up too. For $299 you get the phone and can leave at any time without penalty. Of course, the device won't work on any other networks, but you can sell it and recoup some cash.

In addition to the Sprint network consideration, you have to think about how the how the update situation will sit with you. The Moto X elsewhere either already has, or will soon have, KitKat. The Republic version is lagging a little behind, and will probably continue to do so. If a somewhat delayed update schedule and Sprint's network are not deal breakers, the Republic Wireless Moto X is a great buy.