Slater
Headphoneus Supremus
Aside from the different neckband, is there anything about the BT10 that warrants upgrading from the BT3?
Not that I can really tell. It pretty much boils down to a different neckband style.
I guess it would be worth buying if you need aptX, and you only have the non-aptX version of the BT3. Or if you are in the market for a good BT cable (like if all you had was the crap KZ ones).