Just posted my review of the J1 --
http://www.pcmag.com/article2/0,2817,2393556,00.asp
After a week with the camera, I have to say that I like it... but I would never by it for myself. No manual focus rings on the lenses and the extreme crop factor make using older glass via a theoretical adapter a tricky proposition for a wide-to-normal shooter.
It is as fast as Nikon claims -- 10fps, 30fps, or 60fps for about 13 shots. And I was happy with the quality of the RAW and JPG files coming out of the camera, although it's harder to control depth of field with the slower lenses and smaller sensor.
As someone else in the thread said, would be a good camera for the wife. Fast shooting is great for sports -- I shot some at a baseball game last weekend. Still trying to find time to go through my shots from that, but will track down a keeper or two shot with the 10mm as requested by Juan and link them here when I find the time!