LG is known to pull no punches when it comes to dazzling designs. And the KF510 looks nothing less than spectacular. A shiny metallic finish, a classy silver strip running around the edge, and a black-gray gradient on the front and back... flamboyance could well be its middle name. The device is thin enough at 104.5 x 49.5 x 10.9 mm, but at 91g it's also a bit heavy for its size. So far so good, but does it live up to its looks? Let's find out.
The KF510 incorporates a slider mechanism. It works fine but for practical purposes it can be a bummer. There are no ridges – that is to say, the front is absolutely flat and this hampers an easy slide. Often you will be reduced to pressing down on the front, maybe even the screen, to get it to move up. This is a pity – the phone is a fingerprint magnet to begin with, and secondly it's enough to cause the phones to start creaking soon.
Another problem is that the upward slide is facilitated with a bulk of the phone kept on the portion sliding up, rather than down. It’s more like the phone is sliding down than up, making the slide pretty heavy.
Apart from the sliding glitch, I think the phone looks pretty useable and snazzy. The lower portion houses the coolest bit – the touch-sensitive keys. The whole pad is made up of many dancing lights that flicker from one end to another every time you touch the navigation keys, which are also touch-sensitive. The call/cancel and the two open keys are also on the touchpad.
For good measure, the phone incorporates a lock slider on the right, which is the mainstay in getting your phone to unlock – or to get to the home screen. Every time you need to access the menu while you are on a call, you will need to press the camera/MP3 button. Also, you will more-or-less need to touch your chin to the touchpad while talking. Hence, while talking the touchpad will be out of use as a rule, unless you press the camera/MP3 button located right below the lock slider.
It would be a niche to me.... 
