It smooths the parts good, but it has a number of hangups. For one, it the basket seems to have a very thin coating on it that is coming up with the parts, sticking to the soft, melted bottoms. Hopefully this will stop after a while. In the meanwhile I just stand it off and apply acetone with a cloth to smooth the sanded area. The other problem is it seems like the acetone disappears the moment I open the lid. Which means I need to add another splash of acetone if it didn't do the job the first time.
So it's still a learning process, but it's great to have this tool.