I have both the SAE5000 Impulse Noise Reduction Unit and the Burwen/KLH TNE7000.....I prefer the TNE7000, as it does not leave the random "thumps" when it removes the scratch sounds, like the SAE unit does, although the SAE does a better job on seriously loud scratches....I am considering the SC-1, and would be very interested in hearing from anyone who has used the SAE5000 and the THE7000 AND the Sugar Cube SC-1, with any observations, comparisons, etc........I would also like to know if anyone can compare the performance of these units to that of the Esoteric Sound Surface Noise Reducer.........