I just spoke with Obi today and they confirmed the OBi508vs is not OBiWiFi compatible. So if your planning to use this with WiFi, it wont work!!
Did they say whether it was compatible with the BT device or USB storage? It would be a real shame if they didn't support those.
With a commercial grade device like the 508, I highly doubt most customers would be willing to compromise their communications with a wireless connection. The potential for drop outs during heavy use with full utilization of SP's would be untolerable and result in multiple headaches for Obihai. I would say if you really wanted wifi with your 508, you should look to a wireless bridge or something much more expensive than an Obiwifi.