meh, i'm on my second razer death adder. it's by far the most comfortable mouse i've used. When it dies(it eventually will as i am constantly taking it places along with my laptop) i'm gonna splurge and get the wireless razer mambasa so it cant short out.
I like the fact that you can add weight easily if so desired, and the damned low to insane high DPI is awesome also.
How much does the mouse normally weigh? One reason why I prefer corded mice is because of the lesser weight. And the fact that wireless products are easy to lose (I have lost my wireless keyboard... the thing is huge...).
How is the comfort overall? I liked the Logitech Click!, but not so much for the Click! Plus.
Then there's size. I have grown accustomed to the click, which I always have my wrist on my mousepad.
Then there's also the laser sensitivity. Will it work on most surfaces? All surfaces? Mousepads only? I like to use a mouse on both my bed, carpet, and fiber board, with the occasional felt blanket. Can this do that successfully?
My only complaint though...
I never did like buttons at the thumb... ruins comfort and my hands are too big to use them easily anyways. Same with a button below the scroll wheel. looks decently badass though.
Luckily, the Mx400 just came out (MX 610/620 are wireless versions) which is in the same shape, but a little smaller.
Sometimes Logitech kills an excellent product because it cost to much to make. The v450 replaced the V400 which had won awards for design and function. http://www.mobilewhack.com/images/logitech_v400_laser_cordless_mouse_1.jpg
Its a very cool mouse for notebooks, but some QC failures for many people thou for the laser. Its the only mouse that uses a spring-loaded slot for its USB receiver. Works great.
MX700(the wireless mouse that shows wireless can work without sucking)
MX518(never detailed by logi, but 500 reports per second is sweet) <-best 19$ mouse EVER thanks staples
G9 (does not like soft mouse pads much, The grips peel like hell, so its a great mouse with a crappy finish, but i still use it)
the only problem i have (with almost every mouse) is the fact that my pinky and ring finger have no place to rest. Granted, I have wide hands. But all but one logitech device have this same problem. making my pinky get annoyed. Andy why is pinky? not in my dictionary? odd.