Good Product or Nonsense?

I've used Optrix for years and had only positive results with it.  It seems to improve the sound of some discs noticeably, though some it doesn't seem to do anything for.  I agree that using it on gold CD's may not a good idea.  I've used L'Art Du Son cleaner with good results as well, though it is more expensive.  

I've been using Optrix for about 3 weeks now. I buy a lot of used cd's & know for sure they sound better when they are cleaned. Can't really say if there is an improvement using it on a "clean" cd or not. Also hope David is incorrect here because I've cleaned a couple dozen already... Good to hear inna and others haven't had any issues with it. 

Thanks for all the experiences! 
Does anyone know if there was a more recent legit review
that followed a scientific method? 

If not why?

If I wanted to do it the right way I would get, say, four copies of a well done cd and compared Optrix, LAST, Auric and Walker treatments. Yeah, maybe better not to use Optrix on valuable gold discs. I treated three gold cds with it but only two Mo-Fi ones gave me that haze, another one didn't. No idea why. 
I have a top loaded player and clean the lens with some Disc Doctor or whatever it is fluid that came with their cleaning disc. I rarely play the player these days, as I remember there was a small difference when cleaning every 50 hours or so. Maybe it was 100 hours, not sure.
I only compared Optrix treatment with washing the discs in warm water with kitchen soap. Yup, Optrix was better but soap and water was better than nothing.

Another +vote for eye glasses cleaner or windex for fingerprints/light scratches. I tend to buy used CDs weekly and have never experienced an ill effects. Rubbing alcohol and/or soap and warm water works well.

Happy Listening!