The Good: They are very light, strong, come in a great variety of colors, pedal smoothly, and they are very durable with a lifetime warrantee.
The Bad: The only problem i had was that after i had ridden them for a few months i tried to take them off and could not do so easily. i ended up denting the inside of one are terribly and needing a puller too to get them off. Probably my fault for not putting on anti-seize or grease.
These have been great cranks. Been riding them for about a year and a half and love them.