As a CLEAR member (signed up 3 years ago, weathered the lapse and now using my 500 days of remaining membership), I can assure CLEAR is much faster than the "elite" lines at SFO. Now that the 1K/GS line is gone and all elites are equal - the "elite" line is a joke. I regularly wait upwards of 20 minutes. With CLEAR, my average wait is under 3.
As for CLEAR locations at SFO, I prefer the international security CLEAR lane. It is located at the G terminal security area closest to BART. The domestic one is also fine. It is where the old elite security screening used to be (under the stairs area).
The new clear scans your BP and your biometrics. They then tell TSA you are CLEAR and they walk you to the front of the security line.
Do the TSA dance and you are done!