I love the Ecodrive. I cannot wear typical watches because of some magnetism. So, I have a few very expensive automatic watches from Longines, Oris, and Tag. I was surprised that the Ecodrive would work, but it does and is at an unbelievable price. The Ecodrive actually holds a charge better than any of the automatic watches. And, I don't need a winder yet it will not lose time just sitting in my bedroom.