I have the Shoei Neotec 2, great helmet, comfy, functional and looks great IMO. The dedicated Sena Comm System (purchased separately) fits really well and is completely integrated into the helmet. External controls are easy to operate with gloves.
The sound is good and with the sound boost I can hear music & phone with earplugs. Bluetooth link with my iPhone is solid. Voice commands are ok, although I sometimes have to repeat commands. Siri commands also work.
The phone call quality is very good, many have commented that they would never have known I was on the bike. Bluetooth music works well. Not used bike to bike comms.
The radio is pretty crap, needs a better aerial, can only get a couple of channels with decent clarity so is pretty pointless.
Expensive bit a kit when bought together. I think the underlying electronics are a little dated (Older tech) but works well enough for me.