Music playback was pretty good with nine hours of music from a microSD card before the fully charged battery gave out. And I do like the fact that a side-mounted button calls up the music player on a short press and the camera on a longer one.
This button doesn't work at all for the camera when the slide is closed, instead doubling up to unlock the phone and power up the touchpad. This is because the lens belonging to the 3-megapixel camera sits under the slider on the back of the casing, so it is protected when not in use. The camera comes with a teeny flash and a small self-portrait mirror. There's also an anti-shake mechanism and autofocus, all of which bodes well on paper. In practice, however, the flash is too small to be of much use, and the anti-shake mechanism, while it works well enough, is let down by shutter lag.
My sample shots are a mixed bag. The coloured dish, photographed indoors under normal household lights, is a bit grainy and lacks sharpness. Outside, the chair, photographed on a very sunny day, is not uniformly white (there's a degree of colour shift), though at least detail is good. The flowers, on the other hand, photographed quite close in, are very clear and sharp.
The bundle of software runs to mobile email, calendar, memo maker, FM radio, voice recorder, alarm, calculator, stopwatch, unit converter, world clock and Web browser. The KF510 will share information with your PC via a USB data cable that uses the same proprietary connector as the headset and mains power adaptor.
This is a good-looking phone which is mid-range when it comes to features. If you can live with the touchpad and like the white lights concept then it may work for you, but a full touchscreen or mechanical buttons might be a better bet.