For me the best compromise between amount of artifacts (like ghosting) and smoothness of the playback is setting framerate to "2x original framerate" instead of "to screen refresh". And setting Artifact Masking to "average". It reduces artifacts significantly but some still can be seen, i.e. when an objects moves in front of complex pattern like trees' leafs, grass etc.
If you leave default framerate (to screen refresh), and crank up Artifacts Masking to "highest", there won't be any artifacts whatsoever but also smoothness will be strongly degraded, but still better than w/o SVP..
I am waiting for SVP team to come up with new or improved motion interpolation algorithm