Only good if very warm. They harden up like a rock in cold weather and become useless. D30 seems to be much much better in colder weather.
They are heavier than the normal hard foam pads.
But I like them: they are much better if in an accident, and they are VERY flexible, so they fold up much better and fit in tight places (saddlebags, etc.)
There have been no questions asked about the Bull-it Cardinal Hip Protectors.