From the CLEAR web site:
Clear members still proceed through metal detectors and x-ray machines operated and regulated by the Department of Homeland Security but other parts of the process are expedited. When you approach the lane, our attendants will help you with the bins and to get ready to go through the checkpoint. This alone helps our lane speed by as much as 30%!

Wow

-- they help you with the bins for $100/year.

Oh - and despite the fingerprint/iris scans and the fancy card you are issued,
you still have to show your ID. Save your money!