For some reason, my SD feed has fewer cities on the LDL than the HD feed. The SD only has three, whereas the HD has six or seven.
Also, as Steve-O said, the IS2 does not have the animations for the alert screen. Another example of how inconsistent they were.
The Welcome page does get old after awhile, and honestly, the Summary page goes by so darn fast that they could probably remove that too. Also, as far as the backgrounds, I wish they could somehow program them to show certain ones for a certain time of day. Seeing a sunrise background at 10:00 at night just didn't seem fitting...