I got one of these in blue leather earlier this year from Woot. The band functions as it should and costs much less than the ones sold by Apple and others.
However, if your skin is sensitive you may want to avoid this band. I’ve worn it almost every day for months, and lately my wrist gets itchy under it. Whether it’s the dye in the leather or some other chemical used in making it, I’m not sure. Because of this, I’ve switched to silicone bands and no longer have the problem.