I like the Plantronics CS50 headset, but the over-the-head band that came with the unit was very cumbersome and difficult to adjust. Also, there was no padding on the ear, and it became irritating after awhile. The behind-the-ear device did not work well because I wear glasses.
This Uniband replacement is the way to go. It includes two pads for the ear: one of foam and one with a "leatherette" cushion. I can put it on or take it off quickly. My ear cartilage does get a bit sore eventually because of my glasses, so I often leave the whole thing on the charging stand. When I receive a call, I can pick it up and put it on so quickly that I do not have to wear it overlong. Highly recommended over the original equipment.