We have pretty much all Myler bits for our horses. I've had less expensive bits start falling apart but I have one Myler I have used for years and its the same as the day I bought it. Trust me its gotten tons of use. I just got a comfort snaffle this summer for transitioning my filly to a solid mouthed curb bit which is what we finish in. I really like the action of the comfort snaffle since it doesn't have the true break of a regular snaffle.
All that aside, I think they are worth the money. They hold their value in resale and will last a lifetime.
"Until one has loved an animal, part of one's soul remains unawakened..."
- Anatole France