I guess we'll see if this is OK by the forum rules or not! My opinion is, that most tweaks are harmless, and some may actually help. (Heck, I have a very expensive balanced power AC unit that some people may consider a tweak, but I think could be considered as absolutely necessary for "clean" audio and video reproduction...) But some tweaks may have hidden potential dangers. I put the Auric Illuminator in this catagory. Two parts to this product: 1) Black pen to coat the inside and outside edges of the DVD or CD, and 2) The gel that gets applied to the bottom or read surface of a CD or DVD. ** The following is my opinion, and you can flame if you want, but I'm just tellin' ya what I think... As for the pen, I thought that the "green" pens used for CDs in the early 90's, had been thoroughly debunked by the mainstream press. With data and measurements and listening tests. Doesn't matter anyway, because I don't consider the black pen as being able to do anything bad to the discs or player. The issue is with the gel. The gel gets applied to the optical surface of the disc. 1) CDs and DVDs are made in a clean room. But, you would apply the gel in your house or apt. Definately not a clean room. So, while the substance is being applied to the surface of the disc, you are also incorporating dust, dead human skin cells, dander from any nearby cat or dog or rabbit or whatever to the surface of the disc. Not good in my opinion. Plus, I don't really think you could get as uniform a layer by hand as you'd need or want as say, in a piece of equipment actually used in one of those clean rooms to make a disc (spin coater, sputterer, PECVD machine, etc). 2) CDs and DVDs are read with lasers. Laser light contains energy. The light travels through the polycarbonate layer, which is mostly transparent (but some of the energy from the light does get absorbed into the plastic), to hit the back Al (or Au) metal surface where it gets mostly reflected (with some absorption), and then travels back out of the polycarb again. Then, the detector looks for differences in the amplitude of the reflected laser light from the pits and plateaus (valleys and peaks, "lands" and "mesas") inscribed on the metallic layer. So, since there is heat input into the disc from the laser, then there can be localized heating which can result in the gel substance being evaporated from the surface of the disc. All over the inside of your player. There is also the fact, as someone pointed out on another forum, that gee, I can point a pocket pen-light laser pointer at a piece of paper all day, and not see a temperature difference. Well, I would say that 1st, did you put a thermocouple at the point where the laser is hitting the paper and actually try to measure any temp increase? And then 2nd, that a CD/DVD player laser is focussed to alot smaller spot size (microns vs mm) and that there will definately be differences in heat generation and retention based on that too. (I.e., the heat flux, heat per unit area, is a lot higher.) All has to do with stuff like Planck's constant, the speed of light, the wavelength of light, and such as that. You can certainly argue about the *amount* of energy that's input into a disc from a laser, but you cannot argue that there is, and in fact, *has* to be an amount period. Plus the fact that in general, a semiconductor laser in a CD/DVD player is made to alot more exacting standards and quality than a pen-light laser pointer with a key chain attached to it run by a couple of AA batteries. (Things like the Si crystal quality, recombination-generation sites within the band gap, efficiency, the quality of the wave guide, etc.) Although there are certainly portable DVD/CD players powered by batteries! I would never ever say that dang, you treat one disc with the gel, and wham-o, your player is now trashed. I'm talking about many discs played over time. And, there are obviously other heat sources inside a player too: the power supply, the motor to turn the CD/DVD, the electronics themselves, etc. (Ever see the big honkin' heat sinks attached to a Pentium or PowerPC/G3/G4 microprocessor? Those things give off heat like you wouldn't believe! There are also obviously ICs in DVD/CD players too.) Plus, some people like to stack components above and below their DVD/CD players: just another source of heat that could eventually get to a disc in a player. And, a personal observation: I just entered the 90's and got my 1st PC (and now, standalone) CD burners. I play a std DVD or CD in my DVD player. No biggie. Disc comes out room temp. But I play a CD-R, and the disc is noticeably warmer when it comes out of my player. Hmmm... So must be that the reflective properties of a CD-R are enough different that the heat from the laser, internals, etc, are such that it simply gets warmer. And, as a lot of us know, most DVD/CD players enclosures are made out of plastic. Plastic is a notoriously bad conductor of heat (and electricity, btw; same cause: it's an insulator), so once the heat is inside a player not much of a chance of it going away except through the tiny vent holes on the top or bottom of a player. And, this is heresay I know: I have *heard* that if you treat either SACD or DVD-A discs with this stuff, that the discs become unplayable. Now, me, myself, and I: I would think that if Auric Illuminator isn't good for SACD or DVD-A, probably not good for CDs or DVDs either. Now, I'm not saying that Auric Illuminator is definately bad stuff and that you should avoid it like the plague. What I'm trying to point out, is that in my mind, there are enough reasons that there could be problems with the stuff that you might not want to risk it. I wouldn't anyway... I would take the $40 for this stuff and buy and enjoy a couple more CDs and/or DVDs.