I was told by a German tech that trumpeters will purchase all kinds of wild-promising accessories as long as they cost less than $50. Mea culpa!
For what it's worth, I've found that Mark Curry's accessories do what he says they do. It isn't always an improvement (the better slotting from his CCAPS didn't do anything for my E3L) but I really like his Monster Sleeves. The sound feels as if it has more core and the sound is darker by about one cup depth. Multiple tonguing is cleaner as well.