I've owned both a G15 and afterwards a G11. As an avid WoW player, the keyboard was great. Backlight was beautiful, macro keys were easy to set up and could be applied to a multitude of functions, LCD (on the G15) was great while it worked.
Now, it must be said that I can be partially responsible for my negative experience with the keyboard, but I just wanted to warn everyone else nonetheless.
I have played with my keyboard on my lap for years, whether its desktop or I'm playing from my couch. As a result of this, my USB cord attached to the computer gets moved about a little bit more than another average user. For both the G15 and G11, I had the same problems - the Rubber Connector that helps the wire pass between being outside and being inside the keyboard splits and erodes away rather rapidly (both cases within 6 months). After this occurs, the smaller wires inside the cable begin to split in half from being bent in the same place too much... the result is that the keyboard completely stops functioning. For both keyboards, I ended up having to perform "surgery" on them, by unscrewing everything , using the extra slack wire inside the keyboard and splicing it together before using duct tape to seal it up. Whenever I did this the keyboard would work fine again, but in the case of the G15, the flip up display stopped functioning completely (thus why I bought the G11 the 2nd time around). Eventually, if the same wire frays twice, there is insufficient excess wire to splice it, and the keyboard becomes unusable.
Essentially, my experience was that the G15 had a lifespan of 1.5 years, and the G11 had a lifespan of a little over 1 year (in the case of the G11, I was paying extra care to not let the wire move too much, but it didn't matter).
All of these issues could be effectively fixed if the rubber connector on the keyboard was more durable/better quality.
If you're like most gamers and your keyboard sits in one place, then buy this product and love it - its spectacular. If you're more moblie like me, keep praying Logitech eventually makes a wireless gaming keyboard.
