There is an overwhelming amount of reviews for this product. I wanted a bluetooth that worked. I know that sounds funny, but to me it seemed like sketchy technology that wouldn't work well.Well, this one works great. It's comfortable, and I wear it for hours at a time. The wind reduction could be better, but it seems that the other models with better wind reduction have a tendency to fail in other aspects (low hearing volume, hard to use buttons).The only button on this unit that's hard to press is the one that you use to turn it on and off. That's fine for me, because I don't want to accidentally turn the thing off. The volume rocker and "answer" button work fine as well.These are also selling for less than half of what they originally were. Save some money, snag a 510, and enjoy the technology as it should be.