Almost forgot about our little club here...
Back in september I finally gave up on my G5 for home use and moved it to my office. It's still working fine and looks amazing, but the laser sensor started to do funky things. I've re-checked all internals, USB cable, passive components, power circuitry, and it seems to be OK but occasionally (especially during active FPS gaming) I'd have sensor glitches, where it would lose positive x-axis for a second or two, or start jittering every once in awhile.
Got a new wireless G603 back in September. So far I'm very happy with it, and I'm still on nearly full charge of 2xAA batteries that came with it. Logitech did not lie - it can do 1+year on a pair of batteries.
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It's actually pretty good nowadays. There are, however, few very important things to remember:
1) Make sure that your wireless receiver is not blocked by anything (e.g. don't install it on a rear I/O panel)
2) If you have no other choice - use some sort of USB extender.
My G603 had one in the box, but it's not very good. I really liked the ones bundled w/ A4Tech Bloody wireless mice, cause it's vertical (like WiFi dongle dock/stand).
Another cool feature I miss in Bloody devices is the ability to tweak RX/TX power of the internal Nordic wireless transceiver. Older Logitech mice had the same chip inside, newer ones have a custom BT/RF IC which is newer and much more efficient, but they've never enabled that feature in software.
The only thing that you'll miss in any new gaming mouse, is that satisfying click of old Omron switches and, of course, heavy/durable plastic.
That was the first thing that caught my attention when I plugged in G603: with batteries it's exactly the same weight as G5, but for the first few weeks it feels like you are clicking on an empty egg shell, cause there is nothing under the top cover. Switches are much softer than the old ones with thick tactile plate, but they aren't as smooth and actually produce more noise due to all of that empty space. I'm thinking about replacing those with some better/quieter switches as soon as my warranty expires and maybe add some sort of padding or filler on the inside.
But overall - it's pretty good. So far not a single desync or disconnect, and the performance is exactly the same as a wired mouse. I'm normally running 2000-2400cpi 1000Hz in FPS games, and switch it to "green" mode for normal use(3000cpi 125Hz). Perfectly smooth, no lag, no jitter.
I've actually started to like wireless mice when I had a boxful of broken A4Tech Bloody mice. Those were almost as good as Logitech, but only after you do some initial setup and tweaking (i really miss the ability to adjust RX/TX power in software).