I bought an SX280 after I dropped my beloved Canon Powershot SX260.
The Powershot HS super-zoom takes all the best of Canon camera's and puts it into a small pocketable camera. On the front is a great lens; on the back a bright screen some finger friendly buttons and a mode dial that has lots of automatic options and scene modes as well as aperture, shutter and full manual modes for those wanting to take more control of their photo's. The automatic modes include a handheld night mode, snow and fireworks as well as creative modes like Toy Camera, Fisheye and my favourite Miniature mode. In video mode you can take smooth full HD 1920 x 1080 at 60fps in the higher quality MP4 format. At lower resolutions you can take ever fast shutter rates right up to 240fps for super slow motion images - albeit at 640x480 dvd quality. Taking video is as easy as pressing the dedicated record button.
The SX280 is an evolutionary upgrade to the SX260 I previously carried. The most important feature the stabilised 20x zoom lens goes from a wide 25mm through to 500mm and remains unchanged. After the lens comes the sensor; it's still 12 megapixels but its considerably more sensitive than its predecessor allowing you to take photos with less noise in darker conditions than last years model.The processor is markedly improved from the 260; you can shoot up to 14fps (albeit for only 7 shots) in the high speed mode. The autofocus is noticeably quicker that its predecessor; a faster autofocus lets you get that picture before its too late to take it. Besides the improved sensor and processor the remaining new feature is wifi which lets you transfer pictures using a Canon app you install onto you smartphone. Its not the most useful feature in the world; and mainly just a drain on your battery.
The battery life of the 260 was generally pretty good - the 280 on its first trip out took over 120 photos with the GPS turned on (in Central London) before the battery light started flashing. With the GPS turned off its rated at 210 shots so the GPS hunting in the city centre cost me about 90 photos.
The extra sensitivity in the sensor and the general increase in speed thanks to the Digic 6 process make the 280 a great improvement over the 260; far more than the top level spec's might suggest. At the time of writing though the sx260 which is maybe 80% of the camera is considerably cheaper and remains the better choice till the price of the 280 comes down.