No need. Sometimes the difference is non-existent. I would guess that the larger the TV screen, the more effect it may have. The differences are usually seen in long distance shots. I have found that scenes containing lots of greenery, like forests for example, can show more apparent detail.
As I said, leaving it on does no harm. Oops, just realized there is a typo in the command I gave you. It should be echo 1 > /sys/module/amvideo/parameters/super_scaler. I left out the “>”. That would explain why you are seeing no change
PS. With SSH, use the “cat” command to verify and the value returned should be “Y”. So:-