I've got one because the only output I can get from my mobile is Bluetooth. Don't like it much.
The sound quality is good and the mic is OK but
-It would not fit on my Schueberth C2, BMW System 5 or wife's System 4 without cutting a lump out of the neck skirt.
-It's a pain having to fiddle the mic under the edge of the helmet and get it comfortable every time I put my lid on.
- The mic arm is too short for flip lids
- It's a nuisance having to remember to recharge it
- It's, stupidly, not claimed to be waterproof
- It's easy to catch the mic when carrying the helmet -waiting for it to break off
Other than that it's great!!