I have used Gruv Glide for at least 10 years. I wouldn't think of doing without it. It reduces needle wear, increases many positive playback attributes including quieter surfaces, better bass, greater mid-range and upper frequency clarity. It should only be used after cleaning a record on a record cleaning machine since it is a dry lubricant and will scratch a record if used on a dirty playing surface. Last Record Preservative only reduces needle wear and imparts no improvement in sound quality.