The big caveat, on a Vera3, is that you may need either a powered hub or a larger power supply.
Mine was failing using the shipped wall-wart, a bus powered 4port hub and one USB Serial port. This is the config I had on my Vera 2, and it worked a charm, but the V3 power supply couldn’t give enough current to supply the config.
Mine is not powered and I use it on the VeraLite to connect the PowerMax and the RFXtrx. It is working but the receiving capabilities of the RFXtrx are reduced, probably because the RFXtrx is not enough powered.
So a powered model is probably a better choice.