I have used VMWare stand-alone converter to move VM's from one ESXi to another, and changed the IP afterwards on evaluation appliances.
That worked fine for me.
Please make sure that you installed a production version of virtual appliance (CP-VA-500, CP-VA-5K, CP-VA-25K) and not the EVAL appliance before moving into production. The EVAL appliance will not allow you to do upgrades to newer releases (the upcoming 6.1 for example).