I can't speak for the 550, but I have the 220 and I really enjoy using it. The user interface is intuitive and easy, IMO, and I imagine the 550 will be similar. The only caveat is that the range on the flash is rather short - if you want anything beyond about 8-10 feet, you're out of luck.
I myself have my eye on the Nikon Coolpix 5400, which comes out this summer. I Probably won't buy it but it has a very nice set of features. I know, blasphemy. :) Hey, if Pentax made one I'd be all over it...
