I use it, and like it. I have an S3, with Touchwiz, which generally gets no love around here. I actually had no real dislike of Touchwiz, but the app LIghtflow, which I rely on, doesn't get along well with Touchwiz, so I decide to try Nova. It's a bit smoother and quicker, has many more options for configuring the home screens, including customizing icons and putting more rows and columns on a page. It will import all your existing launcher settings on install, and there's a free version, so give it a try.