Pretty good mouse, similar to Rapoo's V910, but wireless. Was trying to find a new v910 but it seems it is no longer made – inferior mice being created instead. The G604 has a good feel, although a little slim. Your pinky has nowhere to rest, and hangs off the side. One AA battery should last 10 days or longer according to Logitech. We shall see. The software bundled with the mouse is Ghub, and is not as good as LGS software. Seems incomplete. Thumb buttons are easily reachable. Scroll wheel rattles when shaken in the air, seems ok when on a pad however. Hyper scroll sometimes won't stop on the spot, jumping another 1 or 2 lines annoyingly. Ratchet scroll wheel function works ok. Scroll wheel itself is metal, and is somewhat slippery in ratchet mode. May have to apply some kind of grip solution. Almost feels as if it has a thin film of oil on top. There is no RGB lighting, mouse is completely blacked out at night.
Mouse is overpriced for what it offers, but is the only current 15 button mouse on offer, so here we are. I believe at $90-$100, this mouse would be great. Look into the Rapoo v910 for a replica of this thing at 1/4 the price (with a wire).