Excerpt: I bought the logitech g500 on sale off of newegg a couple of weeks ago. When I saw pictures of it online, I was a little unsure about the design (covered with bullet holes), but when I actually got it, it looks cool.
Summary: After a year of use, the left click button seems to have broken. It often registers double-clicks when I click it once. Also, when I hold it down (to charge a weapon/spell in games for instance) it usually releases the click even though my finger is still done. It makes lockpicking in Elder Scrolls Online impossible. I did like the braided cord for durability.
Summary: Absolutely superb mouse! Until my wire got pinched at the point where it enters the mouse and like my Logitech G5 only worked intermittently before completely dying on me due to wire issues. The braided cable helps with the issue but you have to be careful not to strain the problematic area.
Summary: I've owned this mouse for less than 2 years, and once again, it has stopped working. I've owned the Logitech G5, G7, and G500. I love the way they way these mice fit in my hand, but other than that, they are trash. I've gone thru replacements of each model. It is extremely frustrating when you go to use your mouse, and it just doesn't work. The common double click issue is always happening, until one day the left click doesn't work at all.
Summary: This was my first gaming esque mouse and I must say, I'm very impressed. It fits nicely to my hands so I can play for long periods of time withou any hand cramps or anything. Very quiet, responsive, an easy to use. Also easy to set up. Highly recommend for any person interested in getting into PC gaming. Goes GREAT with the Logitech G510s keyboard.
Summary: All in all, this is a pretty good mouse. This mouse is basically the updated version of the Logitech MX518, which is the mouse I used before this one. It is the same size and shape, with a better sensor, more buttons, and higher sensitivity. Adjustable weight is nice, but I prefer my mice light anyway so I am not using them. In fact, I opened up the mouse and removed the assembly that holds in the weights to lighten the mouse even more, and it works better for me now.
Summary: It gave good service for 23 months. Then the left button started doing double-clicks, like others who have reviewed here. I really liked the feel of this mouse. I like them heavy, so I maxed out on the weights, and over a short time realized that using the programmable buttons held no benefit to me. Still, it had a good feel, and I'm sorry but fifty bucks to replace it with one that will also fail is just too much. No more Logitech mice for me.
Summary: EDIT: 6/24/2013 -- 25 days after purchase. The G500 has started exhibiting strange behavior after less than 1 month of use. The mouse now sporadically sends left and right clicks to the computer without actually clicking the buttons. When clicking, the issue still occurs and is more severe (left and right click are switched occasionally, mouse click is released without you releasing the button, etc.).
Summary: I purchased this Logitech G500 mouse after my Logitech G400's left-click wore out. Suffice to say, I was disappointed, but there is some good about this mouse. For example, the shape is very similar to the G400's, but slightly improved. The buttons are longer and the grips on the sides are better. When I gripped the G400, my fingers would hang over the edges and my hand would begin to hurt after a while - not so with the G500.