I also bought a few US (blue) variants and they are fine, good tip shape, alignment, dimensions etc but Hakko combines all the essentials Things; the Hakko curve in the handle allows you to squeeze it with two fingers, the handle material is non-slip. the other has no swelling, and worse, the blue substance is velvety slippery. So my hand keeps slipping down towards the bar if I don't hold it back far. The Hakko have a stopper that only allows them to open to a certain limit (much), the blue…