I can comment on my experience with both the Sima and the Video Filter. In short, the Sima, (and I assume the various clones that have appeared) really did a number on the brightness. The image seemed washed out and very overly bright. The Video Filter had none of those issues. I had transferred some VHS tapes to DVD for my wife, and to save time I did two at a time using different players and recorders, one set passing through the Sima, the other through the Video Filter. The wife immediately flagged the ones that had been through the Sima as completely inferior and made me redo them through the Video Filter. The Sima also seemed to get rather hot id left on for an extended time. The Video Filter did not have this problem.