I've had this keyboard since the day it came out, and I'm even typing this review up on it.
The G keys (Something I was well accustomed to beforehand) have been a livesaver in more situations then i can count. From having to simply spam click on something(And save my mouse click,) complicated strings of letters that must be timed perfectly to be macroed (MAGICKA,) And with a little know-how, even pull off complicated FPS mechanics with ease.
I've occasionally had to pop all the buttons off and clean it out now and then, but that's normal.
The One and Only issue I've had with it, And that's causing me to replace it now, is the tabs inside the space bar have broken, Due to an rather careless slap of my hand. Meaning that I personally did the damage, rather then it wearing out.
I love this keyboard, and wish i could afford another. As it is, I will most likely getting another of it's kin, the G110, or G510.
I've been using the G series of keyboards and handpads for since I got into Gaming. I've tried others, but they don't compare.
Gamers, brace yourselves - this is the keyboard that costs £170 - yes you did read that right. For that price you get a whole range of features, including programmable keys and an inbuilt LCD screen. I've owned mine for a few months, having been lucky enough to be sent one to try. I use it for gaming and for day to day tasks on the computer.
Price aside, there's no doubt that for anyone serious about gaming this is an attractive item. The keyboard, which was really easy to install via the Logitech site, has a nice gloss back surround and a tactile palm rest which is made of hard plastic. Logitech have marketed this as 'hydrophobic' as it apparently reduces palm sweat, it is comfy to use if you are going to be tapping keys for some time and making use of the range of features such as the programmable keys.
Before buying it's worth making sure you have enough room on your desk as it extends further back due to the tiltable display (and large detachable palm rest) and is wider than the norm due to the programmable keys on the left. You will also need an extra power socket to power this keyboard. The USB and power cable are fused together which makes for a bulky wire combination on your desk. The built in USB ports are a good feature and supply enough voltage to power/charge devices. On the desktop assuming you have the space this does look the business and the build quality is good, as you'd expect frankly given the price.
The keys can be illuminated using any colour, although I was a little disappointed that you could not customise individual key colour. Certain keys around the main keyboard have a fixed colour, and I quite like the funky font.
This keyboard does not use mechanical keys but uses a keyboard membrane which gives a slight mushy feel. I quite like it and am able to type at a reasonable pace with it and in the main features you are going to use a lot are sensibly placed - the smooth rolling volume control is a boon, and it's easy too to put this into to gaming mode and disable the windows button.
The additional screen is of good quality, although of questionable usefulness, and I've found it a bit prone to not coming on when it's supposed to (you have to unplug the usb socket to bring it back to life) . There are only a handful of apps available on the screen and not that many games. These can be seen here http://en.wikipedia.org/wiki/Logitech_G19 (The list is the same despite being for the G19 and not G19s). I was expecting more from the screen than the extra stats and scores which proved to be the case, however if webcam gaming or youtube whilst gaming is your bag you may find the screen a useful additon. I have got to admit I could live without it.
If you have an ultimate gaming PC, then you are likely to want to complement it with the ultimate gaming keyboard. And this might be it, it's just quite a lot to pay for the privilege.