In short: Logitech has made another "home run".
This mouse, the G500, is the youngest descendant of the MX500/510 series introduced about 5 years back. Whatever shortcomings that series and its immediate successors had, has been corrected in this great mouse.
I won't go into details with the product specs, other than say that the 5000 dpi precision of its laser sensor provides silk smooth tracking on most surfaces (supposedly even glass, if one would be foolhardy enough to use that as a mousing surface).
The mouse is very close to the G5 gaming mouse; same shape, (nearly?) same hand-surface coating (actually, I'm not quite sure if the back coating has the same "gritty" feel of the first G5 mouse, which at bad moments gave associations to nails down a blackboard), same large teflon feet for low mousing surface friction. It has dpi adjustment buttons moved away from the scroll where you would all to easily hit them in the heat of battle. Instead, the MicroGear scroll wheel alternator is placed there, but it has "deep click" action-type button which is not likely to be triggered by accident.
The side buttons are not just two, but three, akin to the MX revolution and MX1100; only the lower thumb button as found on the MX1100 is moved between the forward/backward buttons, but yet quite distinct form these due to thoughtful molding of these two buttons. There is no chance that you'll accidentally trigger these buttons while your thumb is resting in the thumb groove on the mouse left-hand side.
The dpi indicator is in deep, ruby red LED's which is a nice change from the everpresent blue LED's on most consumer electronics today, but that is perhaps just my personal quibble. However, it adds to the very agreeable aesthetics of the mouse, which, while decorated (the "stained steel" look on its back, refer to photos), does not "scream". (Also, there is no 1000-word essay on the back of the mouse in regards to standards conformity, parts numbers etc etc. Only a large text saying "G500" - likewise pleasing to the eye, should you look).
The weight cartridge is almost the same as in the G5, but I'm not enough of a gamer to ascribe much practical value to it; the option to adjust teh wight of the unit is there, your mileage may vary.
All in all, I am very happy with this mouse (made it this year's Xmas present to myself :), as I have been with most of my Logitech products through the years, and as Logitech is a Swiss company, perhaps it is not entirely misplaced to ascribe the same high standards of quality to "their" PC input units as it has been to their timepiece industry. I for one recommend this brand to all that ask, and this latest addition to their product line merely reaffirms their top placement in regards to PC peripherals.