Yes, I used it for a very short while back in like 1983 and i noticed a slight veil over the treble region so I didnt use it anymore.. And I was a teenager back then with a set of Bose 901, a Technics TT and a Pioneer integrated and was just super positive about all the new gadgets, treatments etc. that would come out back in the day.. The record sure looked beautiful after application and I played them.. Then I noticed a "very noticable" lack of excitement "dullness" with my VERY familiar Henry Paul album.. And have to say it got me thinking the gruv glide was the obvious culprit... So, what I am getting at is that back in the day, I mostly just enjoyed the music while appreciating quality sound fidelity (as best as I could afford and understand) and wasnt listening with a super critical ear AND YET, I still noticed the veil.... I am surprised that gruv glide has survived on the market all these years, so I would just say if you want to, you can buy and try, but just do one album and then evaluate B4 going gung ho on many... or better yet if you have a duplicate, do one and compare... You may just love it... Also, having said this.. I find the exact same thing with cds EVERY time I have used products like auric illuminator, Russ Andrews Reveel cd treatment "mold release" that MANY people swear by.. however, when I compare with a duplicate cd, it seems like the "life" is gone out the music... I, one time, decided to bring my GF in for a blind test... She had no idea what I was doing, I just said which cd do you like the sound of the best, played the same song and she immediately said the "that one".. which was exactly the same as I was hearing... the untreated cd....it was obvious.... I asked her why, and she said one song sounded "dull"... so I would just say.. the usual YMMV.. because you read rave reviews on these treatments by many, and yet, I havent found one that doesnt veil the sound.... And the whole time, I am TRYING to like the product!... You always want something you buy to render some kind of perceived improvement, but for me, there was always an opposite effect... Might sound extreme, but run a humidifier for a short time in your listening room a couple hours before listening.... if it is possible....