I have had a set for about 18 months now. 50mm carbon clinchers. They have been great except for two things.

1) The freewheel is LOUD (I tolerate it as one of my MTBs has loud I9s)
2) The spoke tension gets lost far too easily.

This is a product of the surrounding parts and NOT the rim. If I were to do it again, I would probably buy the Chinese Carbon rims only and have them laced up to the hub and spokes of my choice.

Wouldn't hesitate to buy them again though if a complete wheel was the only choice.