I've used Nik Sharpener since the very first version almost 15-years ago! The latest version, 3.0, is NOT one of my favorites, though it does a pretty good job IF you know what you're doing. There are a few bugs in it's automated settings, so you have to make sure to set the proper size of the image manually, or you get incorrect settings! All that said, I do still use it a fair amount. I also use Topaz Detail from Topaz Labs and have used Jeff Schewe's sharpener actions in the past. I've always used LR's capture sharpening (default or more) and never experienced later artifact pronlems with Nik, unless I used too much capture sharpening to begin with.