Tried the Imus bit years ago. . .bad experience on the whole, not impressed with the quality at all, and will never touch another one of her products with a ten foot pole, but some people seem pleased with her stuff.
I have heard mixed reviews on the various bitless bridles. Most of the videos people I've seen of bitless bridles (meant to show how well the horse goes "bitless") make me less interested. I see resistant horses with tense movement and hollow backs, heads up, etc. They don't look much happier, and they really don't prove the point they're trying to make.