The 550 UZ has that killer 18X zoom, however every thing else is pretty much misleading marketing... eg
1. The 15fps burst rate... will shoot images at 1.2MP. At full res the burst rate is 1.5 fps.
2. ISO 5000 - only available if you shoot at 3.2 MP...
Basically read the fine print before you buy this cam... and there is a lot of fine print. My suggestion... buy a Canon S3 IS... its a good 8k cheaper too!