In your opinion, in general terms, how do they help?
The highs are higher, the lows are lower, the mids are...in the middle! I feel the transparency and sheer thickness of music at the same time. Sound-stage improvement was of the highest degree. Dynamic nature of woodwind instruments is now fully present. This is incredible stuff, folks.
Just follow the instructions. Especially important is to back out the screw one full turn after you've screwed it in all the way. That made all the difference!
Only $100 for a set of 4! I don't know how they do it.