Over time, I've become a little bit disillusioned with MIDI-over-Bluetooth. The latency of the CME devices is really low, but not low enough for recording multiple tracks into Ableton.
The practice is to use MIDI tracks in Ableton to play a synth while recording it. Over multiple tracks, tiny inaccuracies are introduced, such that the piece is not in sync. It's a tiny bit off, but it's more apparent the more tracks there are.
So, at least for recording, it's back to good ol' MIDI cables.