I use a Robarts Walker bit.
I do as well. It's very similar to the Brenda Imus "Comfort" bit, and my horse goes very well in it, but it is much less expensive than the one Imus sells. Actually, I used to have the Imus bit and used it for a couple of years, but the center of the mouthpiece began to separate at the joint between the steel and the copper ball. Not just a little, but enough to make me concerned that it would cause pinching on my horse's tongue or that the bit could just fall apart while I was riding.
I learned (from reading messages posted on Brenda Imus' own message board) that other people were having the same issue. I chimed in with my own experience and was surprised (and disappointed) to see Brenda's response to the comments. She stated that horses are "notoriously hard" on equipment and that getting a couple of years out of a bit was perfectly reasonable. . .that we'd gotten our money's worth.
That was when I realized how much she markets herself (and her products) to people who don't have a lot of background in horses or riding, because they would most likely accept her claim that a $70 bit should only be expected to last a couple of years before breaking down and needing to be replaced. However, I'm not new to horses and I certainly expect a longer life out of a bit in that price range. . .I said the same on her message board, and soon after that my comments (as well as comments by other not-so-satisfied customers) were deleted by her.
Not long after, National Bridle Shop offered to replace the Imus bits for a "reduced" cost of $40. Fortunately, by that time I had learned about the Robarts bit. . .and ordered two of them.
Will never purchase an Imus product again. . .more disappointed with her attitude than anything else. . .