Regarding the "Doggie Treats" -
Dan caught me at the SF Bay Area meet, and installed the kit on my Alpha dogs, or at least the dots, and gave me the felt disks to try. I really liked the effect of the dots - they seem to remove the one issue I have, which is an occasionally sharp or hot spot in the sibilance range (I am very sensitive to this). I have listened further, and have decided the "dots" will stay in my headphones.
I was a bit more skeptical about the felt oval disks. I was pretty sure they would have too pronounced an effect. About the forth time they fell out of my headphone bag, I decided to try them. So far, I really like the effect. It is much more subtle than I expected. What I notice is a very slight reduction in the upper range, and a very slight reduction in efficiency. I like slightly rolled off treble, so this is a positive to me. The lowered efficiency (a small effect, but noticeable on my rig) is also a positive, as it makes it a bit easier to run on high gain on my Burson Soloist SL, if I choose to do so. I plan on keeping the disks in for a week or two, then pulling them out, just to compare again. I suspect not everyone will prefer the addition of the disks - they do roll the treble a bit. Great for me, great for many, some will prefer them out. It is nice to have the choice.