Very close to useless in my opinion. Primary search sometimes takes you to secondary keys then into the wormhole. I have not been able to do a good search since the change. Just my 2 cents.
If you have a minute, are there any particular searches that perform badly that you can give as examples? For testing, you can go here and get a side-by-side comparison (forgive the page formatting) Threadloom Demo | TalkBass.com