I looked closer at their plans, and I can't save money at all. In fact, my bill would go up. Using their configuration tool, I am at $44/mo with (500min/1000txt/1GB) and there's a chance I could go over that. There are surcharges that probably take it close to $50.
VM's $45 plan offers more of everything, and I only pay $38.25/month for that plan.
The only advantage is the assumed roaming agreements given the size of their coverage map. This is a pretty good plan for someone who needs the roaming coverage but take a close look at all of their maps for all services to be sure it will work where you need it to.