I used to think the same, but since I got one......I wouldn't go without it. For driving it's great as I can't wear ear buds (Way too uncomfortable for me). This thing (Motorola H500) you forget it's even there, sound quality both ways is great. I agree, if I was an avid phone user during the week (Take train to work no real need for headset), charging it would be a complete PITA. My only complaint is that teh voice recognition RARELY works properly. My buddy has a Motorola one too, (I forget which model he has) and his works fine.
Yeah, you kinda look stupid wearing it, but it is so comfy and you don't have to fumble over wires when you're running into stores and paying for things. The other plus is that all my friends seem to know when I am washing my car. They only call when I am in the middle of suds up to my arse, sun shining strong...etc etc. Now I just wear the headset and keep the phone on the stoop and I can multitask alot easier!