Great Concept, Pretty good hub.
The Good:
The ability to use it as a cassette or a coaster is great. Multiple slack rings allow you to customize the hub.
The Bad:
Slack rings are made of an oil impregnated plastic and can wear quickly.
Overall Review:
Same as the Salt Plus, Dartmoor and a hand full of other hubs. Great idea for those who want to try a coaster but not commit to it.