I actually tried SVP 3 and quit using it because I always got weird artifacts in my anime no matter what settings I used. I've been testing SVP 4, and so far One-Punch Man and Knights of Sidonia have been pretty much flawless, with the only hiccup being the arena scene in Episode 1 of Rokka no Yuusha where the "camera" rapidly revolves around the protagonist, and frankly, I'd be amazed if any automated solution could get that scene perfect. This may be a keeper for me.
Note: I use double framerate rather than refresh rate to reduce the chance of artifacts. I can't speak for 60fps results.