As a owner of a G15, actually two G15s. I will tell you to go for the G110 lol. The LCD screen is practically useless. It is only good for showing a clock and perhaps teamspeak/vent but half the time you won't look at it.
Showing ingame stuff is really useless since you can usually check on the HUD. The only game that I actually look at it is for Bad Company 2 which shows my real time ping and KDR/stats which can't be viewed while playing. Then again those things are quite useless.