As said in the title, branch hot and is directly functional Debian GNU / Linux 8.0 "Jessie."
Works perfectly well and is backward compatible with Bluetooth 3.0 as shown (with my phone). The announced distance seems correct and the signal passes even from one floor to the other despite the metal in the concrete.
Do not heat unlike my previous dongle.
Flow are not great (it's not the Gbit Ethernet either ...) but enough for backups (calendar, contacts ...).
Having no headset, I did not test the audio.
Only small "flat", so to speak, the more spring dongle USB port I thought. That said, it has the advantage of being able to properly take with your fingers (even larger) if one wishes to remove.
In short, it does its job and is mostly used by libristes!
A +
Debcool