I have, using the throat mic system with the single ear phone. They work so so. First, the ear phone isn't that comfortable long term and it tends to dislodge or fall out of the ear with the helmet on. Next, the wind sometimes causes the mic to open. We added the PTT (push to talk) aux. button and it helped. Positioning of the throat mic takes time to get right too. The little ear bud/hanging mic didn't work at all.
Depending on what you want to spend there are several helmet specific set-ups for motorcycle use. We just purchased the AUTOCOM which is highly rated up to 150 mph. It is used on the race tracks. They have 3 or 4 systems depending on what you want to use on the bike ie: radio, MP3, radar det., bike-to-bike radio, cellular phone, etc. They do sell a version just for bike-to-bike.
http://www.autocomamerica.com/docs/home.cfm
There are a few other companies that offer similar set-ups, but this brand is supposed to be the best at higher speeds.
Mac SURE if you use the Motorola radios that you get the Motorola lenght jacks. They are different than the industry standard. The first set-up I wrote of was purchased part by part at Bass Pro Shop. They sell all of the Motorola add-ons. If you go with Autocom they sell a specific connector for Motorola radios.
Janine