It was a great place, I'm sad it's gone. It was my impression business for them took a big hit during the recession. We went several times during that period and the restaurant was 1/3 or 1/2 full at peak times. But it seemed to me that business was bouncing back for them before they closed.
I think they have had some influence on the Bay Area restaurant scene. I find that I will be at a nice restaurant and see something on the menu or order something and think that it reminds me of something at Ubuntu.
Jeremy Fox did some original things at Ubuntu (I think the sunflower seed risotto-like dish was his invention), but the food also had a lot of influences from his years at Manresa, which in turn was heavily influenced by Alain Pasard.