I got the MEE Bluetooth BTX1 and connected my Shure SE 846 with them and here is what I experienced with it...
+ AAC and AptX Sound quality (that is what I bought it for as the Shure bluetooth cable doesn't have any of that... yeah really What were you thinking Shure...)
+ Quality MMCX connectors (well connected and similar resistance when turning the IEM while connected to MMCX as with the original Shure cables, plugging out was a bit harder as it should be on the left but rotating the IEM a bit around the axis when pulling made it easier)
+ Balance (well balanced on both sides, no pulling or rubbing against my head)
+ Battery (surely lasts more as 7 hours, I did not do an exact test but I left it on my head for an entire working day)
- Connectivity (when I wear it tight the receiver presses against my head and I get bad signal with my iphone x in my trousers pocket (right side) so I noticed I started walking a lot with my phone in my hands to avoid connection loss)
- Only 1 connection can be active (I have to switch my phone in flightmode, turn off and on the headphones and then it will connect to my macbook... annoying as heck)
- Microphone sound quality (terrible, I had to hold the micro right in front of my mouth for anyone to understand me and even then it was very bad quality)
- Cheap looking (button panel design is too old and cheap, the rubber cap covering the charging port is a different color, there is an obious line marking where the 2 sides have been glued together, the LED light is soldered to the board and a small hole in the shell lets the LED light come through)
- Clunky controls (the middle button is the one powering it on but it feels exactly the same as the other two buttons so often I end up pressing the wrong button to turn on or off the receiver. This could have been easily fixed by adding some bevel to the middle button or raising it up a bit).
Conclusion: Use the MEE Audio Bluetooth BTX1 to commute and listen to music... not for gym and making phone calls all day.
Screenshot 1: Active Codec: AAC (I was listening to Apple music)...
Use alt key + click on the bluetooth icon to see more details on bluetooth connections when using OSX
Screenshot 2:
1. Raw RSSI (Received Signal Strength Indicator) is quite ok... The MEE Bluetooth BTX1 receiver is located on the part where the buttons are located. You can cover up parts of headphones with your hands to try that out.
2. Data rate is a stable 30000 bytes per sec (~ 240 kpbs which is the song quality)
Use Bluetooth Explorer to get this information and switch codec manually on OSX:
https://www.macrumors.com/how-to/enable-aptx-aac-bluetooth-audio-codecs-macos/
Screenshot 3: Bitrate matches with the song I was playing on Apple Music... all good here.
Screenshot 4: The song I was listening to on Apple Music
Screenshot 5: I then forced the connection to AptX and played a FLAC
Screenshot 6:
Notice a higher bitrate when playing a FLAC file.
Screenshot 7: translated into Kbps
Last I noticed when forcing it on AptX and playing Apple Music (AAC) it still will use AptX at high bitrate to play that music unless you ticked the "Enable AAC" in Bluetooth Explorer to enable using the AAC codec again at which point OSX will prefer using AAC instead of AptX.
Some more pics of my Shure SE 846 connected to the MEE Audio Bluetooth BTX1