It is a joy to take pictures with. Settings are easily changeable and the basic shooting modes do a good job. In the creative modes the photographer can control just about any aspect of the shot they desire. One miss though is the control over the flash. In the basic shooting modes it does what ever the heck it wants. So you have to switch to the creative modes to force it on or off. Maybe this is something they can fix in firmware. It seems like an odd feature on such a user controllable camera otherwise.
The shake the sensor to get rid of dust spots does seem to work. And yes dust spots are a huge problem on DSLR's. I will probably be investing in a cleaning kit for the sensor at some time.
My old EF lens work great. My 200mm with the 1.6 multiplier of the DSLR is effectively a 380mm which is pretty nice. It allows you to get in real close on anything.
The weight of the camera is just about right, it has a nice heft to it, you won't forget you are carrying it but it does not weigh you down.
The function for the most part is a lot like my old old Canon Rebel EOS so it took very little time to get comfortable with the camera. And the magic of digital shows through in that you can snap off as many pictures as you want with out worrying how much it is going to cost to get them developed. You end up with a lot more bad shots but hey you just through those away and you end up with a few spectacular shots that you would have missed with a film camera
I've put up a flickr gallery of what I think of as some of the best shots I've taken with it.