Well I can remember 3 I tried, CD Blacklight, Marigo Crossbow, Statmatt, and one other whose name escapes me.
I have experience no real benefit when using any of the above in my system, one problem is when drawer closes added disc can sometimes move off center causing slippage, I think they work better in top loading CDPs. Thin discs tend to warp/buckle if you are not careful etc.
Of course main benefit claimed by these discs is more accurate reading of data from disc, less error correction needed by your CDP. This is acheived by removing static charge, absorbing/stopping stray laser light, adding mass to CD etc,etc.
If you found one that works for you great, this is the "holy grail" of tweaks because nothing could be simplier
to use......I will have to keep my eye out for "Safari" disc
and may give it a try if price is reasonable.