The Logitech G19 is a gaming keyboard with a color LCD display for displaying game information and other system data.
SpecsUpdate
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Pros
Pro LCD is supported by Aida64
You can use the Aida64 utility to monitor various computer status such as CPU/GPU/HDD temperature or CPU/GPU frequency on this keyboard's LCD. This is really handy to see how your computer is balanced in various games: you can see if your CPU is starting to bottleneck your graphics card (or vice versa), thus gaining significant insight on whether and what you need to upgrade on your PC.
Pro Unofficial Linux support
There's at least one community-maintained unofficial driver for the LCD screen on Linux
Cons
Con Requires separate power adapter
This keyboard requires (and comes with) a separate power adapter in order to power key backlighting, LCD and powered USB hub. Without it, it still works as a basic keyboard without backlighting, LCD and unpowered USB hub. It's disappointing that they didn't find a way to power it via USB (even if using an additional USB cable), the power adapter it comes with is really crappy.
Note that it is possible to mod it so that it is powered via Molex directly by the PSU to avoid using the crappy power adapter it comes with. This gives an additional benefit of keyboard drawing zero power when the computer is off.
Con Legacy product
G19 is a legacy product, its firmware is not upgradeable and the keyboard itself is superseded by the newer G19s model.
Con Unreasonably expensive for what you get
Con LCD Display Shorts Out
In many cases the wires rub bare from the LCD assembly and it shorts out the screen.
Con LCD displays ugly bright white Logitech logo until drivers load
Until Logitech Gaming Software loads and reapplies settings after bootup, you're stuck with a jarring white Logitech logo at full brightness on the keyboard's LCD. This is fixed in the updated G19s keyboard (logo is black), but G19 doesn't have updateable firmware.
Con Uneven lighting
Because G19 uses plastic light guides to spread the light rather than having one LED per key, keys are lit non-uniformly, with some of them being partially unlit and having dark grid-like pattern across. This is a design failure.