Update: staff improved since last visit, great location, fun architecture
I have to stay at this hotel once or twice a year, as I work across the street and sometimes I have to work very late a few days in a row. This visit showed me that the staff, from the bellman out front through the checkin desk all the way to maids and Regency Club attendants has improved greatly since my last visit last year. Kudos to all the staff for being friendly, helpful, and still acting like real people, not corporate-trained automatons.
I received the room I requested on Hyatt points. While the room was in decent shape, there was some wear visible on the cabinets, the air conditioning was very loud, and the blood or chocolate or coffee stains in the middle of the carpet were noticable (though the rug had clearly been cleaned). It's always a little disappointing to use points and get the worst room on the floor, but if this is the worst--it's not too bad!
The Regency Club at this hotel has a very limited selection of food, no sweets at night time, but a really great view from the top floor (it used to be a rotating restaurant!). I skipped the breakfast service after experiencing noon-time and evening fare. 
the location is great for exploring San Francisco, and I never get tired of looking at the large, inverted-pyramid lobby. Even though they don't have plants hanging off the sides anymore, the "shower of lights" is nice. And there's a Ripley's Believe It or Not exhibit in the lobby that's fun, too.