Great suggestion. I've been using the MB-BT01 for 3 months now on both the DKC-850 upgrade and on the new Enspire and have to say it's been working beautifully. One suggestion that works great for me is the iOS app - midmittr - I believe it's still free and works great to initially connect my iPhone or iPad to the BT device or re-establish a lost connection.
Also for those who want less cables, the Logitech Bluetooth Audio Adapter for Bluetooth Streaming works great to stream audio from any device with audio out to the piano audio in. It's stable, always re-establishes a connection to my iPad and not very expensive. For example when watching Disklavier TV, it allows me to send the audio and data from my iPad to the Disklavier without clumsy/unsightly cables.
Hope this helps.