HS850 vs Scala 500 or another bluetooth headset?

I've just purchased a Moto HS850 bluetooth headset which is paired with
my V710. I have some concerns about the clarity of my voice -
particularly when the headset moves a tiny bit and is so close to my
cheek that the sound is muffled.

I can return it for 13 more days but want to be sure there is something
better - if not, I'll keep it.

I've read very good reviews of the Scala 500 and I'm wondering what else
people might recommend.

TIA

Louise