Im curious what HD riders use for 1/2 helmet headsets since the majority of headsets are full full face helmets.

We currently have just this one model for 1/2 helmet riders, shkbth2

 

Shark,
I use Sena products on full face helmets. IMO, the best and most affordable product on the market. Sena makes various versions, including half helmet models (linky). The SMH10 and SMH5 vary in functions. I bought a first generation 3 years ago before FM radio was an option. These devices are amazing. I have no affiliation, just a end user.

http://www.revzilla.com/motorcycle/s...r-half-helmets

 

I use a Sena SMH-10 with earbuds. I have mounts for my 1/2, 3/4 and FF helemts and am able to use it on all of them.