A:Answer I find it was more comfortable than any others of this form factorI tried. I can't wear in-the-ear headsets because of a very small ear canal, but this one is pretty comfortable. The only problem is that heavier glasses frames sometimes put pressure on the ear hook part, and that can get uncomfortable. (Don't have this problem with my thinner frames.)
You might also consider an over-the-head style to bypass the whole in-ear discomfort. They aren't as easy to carry around, and they certainly aren't inconspicuous, but the sound quality tends to be much better, and you don't feel like someone has a battering ram to your ear canal after ten minutes. Blue Parrot and Plantronics both make very good over-head bluetooth headsets.
