I've owned a G15 for about 10 months now and it has never had many problems. I've only once used the USB's on the keyboard though. I originally had problems getting BIOS to allow me to use the board during boot up but a quick change to PS/2 (or is it P/S2? I cant remember) keyboard and changing the setting to allow Legacy USB Keyboard/Mouse use solved that. If your BIOS doesnt support it, maybe look around for a different BIOS version that might have it.
My friends and family laughed when I told them I bought a mouse (G7) and a keyboard for $150 (that was combined, $75 a piece), I got them off newegg, but after my friends and family used it, they all wanted one. Sure, spending that much on a keyboard is hard to justify but I've never looked back after I got mine working.
I find the keys are a bit on the loud side for a keyboard but they are smooth and solid feeling. The back-lit function is also extremely nice for those who play in dark rooms (like me); they are lit enough to be visible but not so bright that it distracts.
The LCD display does work with multiple games but has recently stopped working with WoW; I think a patch broke it.
To a note to the person who said that it reads the World of Warcraft Profile Active but still does not show the Game stats like Blizzard says it should, that message on the LCD doesn't have anything to do with receiving data from the game it's self. The profile-er program for the G15 detects which executable is in the foreground and then brings up that profile. I'll have to check with my two friends who have the G15 and play WoW to see if their's are working.
There is a very nice little program that allows you to program what you see on the LCD called LCD Studio. You can download it at
www.lcdstudio.com. You can then program multiple pages of info from various things. If you have an ATI video card, you can even watch the temps, clock speeds and so on of the card. It also reads track/artist/album info from things like Windows Media Player, iTunes and WinAmp. If you have fraps installed too, it will display the FPS.
One thing I'd like to mention about it is the G-Keys. These things save my life on WoW and others. Instead of hitting two or even three key's at once to launch a specific move, or moving the mouse there on screen, I just tap one button and it does it all for me. They are completely programmable for any executable on a computer. I even have a profile setup for when I use Photoshop and Word. You can also program them on the fly, in the middle of a game, but I've never really liked doing that, I try to run all my games in Borderless Windowed mode so I can Alt-Tab out to adjust things and that. Either way, the G-Keys are one of my favorite parts of the keyboard.
And finally, the lay-out of the board... Before I got the G15 and G7, I was using a Logitech MX500 (or something like that) wireless Keyboard/Mouse combo. There was always one thing that bugged me to death with that keyboard, and still bothers me with other new keyboards. They re-arrange the Insert, Delete, Home, End, Page Up, and Page Down keys to be instead of 2 rows and 3 colomns to 3 rows and 2 columns. The delete button was stretched vertically to take up two button spots. By doing that, they removed one of the 6 keys and moved it to another spot on the board (I cant remember what key now though). That layout is just different enough to bug me when I went from a full sized, REAL keyboard at work to that at home. The G15 does not have that stupid layout, it has the REAL 2x3 button setup, not the 3x2; It has the layout that has been the QWERTY layout since the beginning of keyboards! Or atleast since I started using keyboards.
One of these days, Logitech is going to release their G11 Keyboard. That is the G15 but without the LCD screen. It should be about $20 or so cheaper so you could just wait for that if you dont want to spend THAT much on a G15.
In one short phrase to sum it up, I think the G15 is worth every penny
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