I've got my Circle since 2 weeks ago. Even I've googled a lot until to order it, after 2 weeks I'm unhappy
with the headset. Unfortunately, has passed the period when I could return them...
The brace neck is so stiff, an ordinary plastic and already I've seen little cracks on the middle where it fit the battery. I've tried all the 3 size braces, the small cuts in to my neck... the largest make the battery to slip on the back and is uncomfortable and the Medium is between the S and L, but the wires are too short and the ear-buds don't stay comfortable into my ear canal... when I'm walking (not running or something hard on the gym) the ear-buds are falling a lot even I've changed all the ear-buds tips. The major problem is when I'm sweating... they are falling every time I'm moving the head and the neck brace is irritating my neck where is rubbing my skin.
I'm not sure, but I'm thinking to buy a Earhoox buds extend... but I don't know if they fit.
When I'm not using the headset, I connect it with the clasp magnets and wearing on my neck, but because the buds it rubs the clothing, the ear tips hole is filled with dust an is unhygienic to reintroduce it in to the ear canal, so everyday I have to clean the ear tips.
To conclude, I'm unhappy because I've paid almost 100 Euro for a headset which is a total design failure... I don't comment on the technical specifications, because I don't have the knowledge to do it.