In reply to EZ:
They (throat mics; no idea about earbone speakers) can be OK. Bad ones are bad, good ones are good. The old Clansman ones for NBC kit were clunky and sometimes painful, but I have a couple of (cheap, chinese) throat mics that I use in noisy environments nowadays and they're fine. I don't bother when it's not noisy, since you're effectively tied into them and can't hand the radio over. The ones I have look very similar to your second link.