This review is somewhat lengthy, but I try to cover all the bases on this device.
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Overall Impression: Very nice piece of hardware, worth the money.
Ok, let's get started.
Physical Properties: The pad itself is of decent size for someone with average to slightly-larger-than average hands. I have long fingers and still felt very comfortable on this device. The keys press easily and are in a comfortable layout. The joystick also moves easily with my thumb.
However, the joystick has a "click" attached to it when you press it down which is somewhat difficult to activate while keeping the stick still. It's definitely a hard press.
There is a non-slip surface on the bottom to keep the unit in place which works perfectly, as well as a comfortable semi-nonslip on the wrist/palm rest.
The LCD is clear and brightly illuminated with customizable lighting. There is also an on/off button for the backlight built onto the unit so you don't have to play with lights on all the time. The backlight for the LCD also backlights the buttons, which means that they follow the same customizable functionality.
The LCD also displays various, customizable, information based upon applications you have running on your system. It has support for all the mainstream media players to display song information, as well as RSS information, email, etc. It also has the capability to display in-game information, but the game itself must support this. Warhammer, for instance, does not offer this support (that I've seen), so there are no vitals displayed on the LCD. World of Warcraft does offer support, so by default you can see quite a number of stats on your screen.
Software:
The G13 has its own software for assigning functions to the keypad. It also has an application dedicated to managing the LCD display. I have not used any other LCD / Programmable Logitech products in the past so I don't know how this compares with them.
In the software suite, you can scan your computer for available known games to the G13. I did not have luck with it finding my WAR installation, but I changed the default directory which could be the cause of this.
If it finds compatible games it will then make available a preconfigured gaming profile for that game. You are of course allowed to modify the profile if you wish or you can choose to create your own custom profile from scratch.
The profile creation is easy. It involves choosing a name and the game/application executable file.
Once you have a new profile, you can choose what to assign to your keys. Your options are key combinations, macros, or scripts. The software makes assigning each of these a snap. It only takes point and click to assign your keys under the profile, which is auto-saved.
The software is also where you are allowed to modify the LCD backlight color. Using the windows built-in color chooser, you can select any value of RGB to backlight your unit with. Each memory setting (1 - 3) can have its own backlight. This gives you an easy way to distinguish quickly which profile you're on.
Macros:
Macroing on the G13 is pretty straightforward. You can launch the macro editor and begin recording keystrokes and mouse clicks and then save them into the macro list. You are then able to assign the macros to G-keys on the board. The macro editor also allows you to add custom durations between events in the macro you're recording, or it can record durations between keypresses as you do them. I find it easier to record the macro first and then add delays later. This is very helpful for Warhammer since it has a global cooldown on all skills.
Scripting:
The G13 has an implementation of the LUA scripting language available for use. It includes most of the math libraries, strings, and some tables. Using the LUA language, and some custom Logitech event functionality (which are documented) you can create scripts to drive almost any aspect of the G13. They allow you to control the LCD, moving the mouse, emulating keypresses, etc. Once you create a script, you can assign it to a G-key very easily by choosing it from a list.
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I think that about covers the G13. I am very pleased with having spent the money to order it. Something to keep in mind. The G13 is fantastic for gaming, but also has many practical uses outside of gaming. As a programmer, I find the G13 works well inside of my IDE for quickly running commands (compiling, debug, synchronization, etc).
I hope this helps you out! I am also not affiliated with Logitech in any way, but I do like their product.