I'll assume that you are asking for honest opinions on the product rather than starting yet another thread to market it. There are a few games that are probably too dark in their stock versions that it looks good in (WOZ, BM66), but there are other cheaper ways to add lighting (like using spot lights) where it is needed that don't interfere with lifting the play field or reflect of ramps and plastics near the edges of the playfield. I personally think JJPOTC looks fine without additional lights and bright lighting will wash out some effects like the fire in the lanterns.
There was a time when this product was constantly marketed for every game, in every thread, new threads, multiple podcasts, etc. that gave it an "infomercial" vibe and caused some of us to sour on it. For me the main issue with the product is that it ruins the ambiance of some games that should be darker (e.g. Tron, ACNC), and the reflection off plastic and metal parts near the edges of the playfield can be distracting.