rgbfilter.com: We take a look at the LG Optimus Quantum Windows Phone 7, with a slideout landscape QWERTY keyboard. The slide mechanism, while a bit stiff, also feels very solid, and still doable with one hand. When holding it in landscape mode, LG made sure that the screen portion was nice and light, so that there’s a solid balance while typing. In fact, when we first got our hands on the Optimus Quantum, it barely registered as a slider. The keyboard itself ranks up there with the HTC Touch Pro 2 keyboard in terms of quality. Individual keys, well separated. The shift and function buttons are actually offset to the left, which makes accessing the numbers and other elements much easier.