While I am not in any position to really comment not having tried one myself I must be honest & say I am VERY skeptical of any benefits, hope this doesnt come across the wrong way but are you 100% sure its not just in the mind thinking its an improvement?
I would love to know the technical reason why something like this would make a difference to the final analogue output, my knowledge of CD's is limited but surely so long as the laser is able to read the pits in the CD's then this is digital 0's & 1's, it sounds like making the CD more rigid is allowing more accurate reading of the 0's & 1's, but surely a 0 is a 0 & a 1 a 1, I didnt think you could like a fainter 0 or 1 signal.
I do try & keep an open mind as like I say I havent tried one myself but the other half of me does wonder if its in the mind or a placebo as they say