NOTE:  Mouse completely broken after 5 weeks - had to throw it out.  Original review follows:

I am a BIG fan of the Logitech Wingman Gaming mouse - in my mind the best gaming mouse ever made except for the lack of a wheel, a thumb button, and optical sensor.  Well...here it is.  Essentially the same design as the Wingman WITH a wheel and a thumb button.  My joy was unrestrained when I saw that this mouse had been made - as if someone had read my mind and made exactly the mouse I would have made for myself.  I had VERY high expectations despite the reviews here and despite the "Fatality" name which to me is a turn-off for any product (being a 34 year old physician I don't exactly start getting smarmy in the pants over products badged with a teen gaming idol's name on it).  But I don't care about the name - give me a good mouse and I'll buy it.  For me this is an upgrade from my current G5.

The good:

- just like the Wingman this mouse fits the hand PERFECTLY.  You almost don't even notice that the mouse is there.

- The three finger buttons are in exactly the right place.

- The smaller teflon feet make it glide much more smoothly than the G5 which tends to pick up dirt more on hard surfaces.

- Tracking seems good - on par with the Logitech G5.

- The wheel has a smooth, effortless feel to it.

- The weights are a nice feature...been done before, but a nice feature none the less.

The bad

- Yes the cord is stiff and short.  Not a big issue for me since my monitor has a USB hub but...come on guys, if you're going to do it, do it right.

- The buttons have a very cheap feel to them.  On the original Wingman the buttons had a perfect snickety effortless action to them.  These buttons are cheaper, more "plasticky," and reqire more effort to press.  Its actually hard to double-click with this mouse.  In my mind thats a huge gaming "no-no."

- The weights, while nice, are nowhere near heavy enough.  The G5 gives you at least twice the heft.

- Where is the thumb button?  Wha?  Was this a design mistake?  You have to practically take your hand off the mouse and reach back to get to the thumb button.  Very poorly done.

In all I do really like the mouse.  I think a lot of the negative reviews are biased by people who either dislike "Fatal1ty," or are used to the enourmous Microsoft/Logitech mice that you can rest your whole arm on.  This mouse has exactly the right idea with some shoddy fit-and-finish work which is really quite a shame.  If it fixed those problems I would be stocking up on them and likely would never need another mouse.

ADDENDUM:  I have now owned the mouse about 2 months.  It has gone completely on the fritz.  The buttons have gone to hell.  Holding down buttons does not result in continuous motion now but stuttering.  The optical sensor has seemed to crap out as well.  Movement is now jerky and erratic.  This is terrible.  I've never even owned a cheap mouse that had these problems.  I had to toss it and go back to my Logitech.  I still really liked the design and I hope that they can get it right next time.
NOTE:  Mouse completely broken after 5 weeks - had to throw it out. Original review follows:

I am a BIG fan of the Logitech Wingman Gaming mouse - in my mind the best gaming mouse ever made except for the lack of a wheel, a thumb button, and optical sensor. Well... here it is. Essentially the same design as the Wingman WITH a wheel and a thumb button. My joy was unrestrained when I saw that this mouse had been made - as if someone had read my mind and made exactly the mouse I would have made for myself. I had VERY high expectations despite the reviews here and despite the "Fatality" name which to me is a turn-off for any product (being a 34 year old physician I don't exactly start getting smarmy in the pants over products badged with a teen gaming idol's name on it). But I don't care about the name - give me a good mouse and I'll buy it. For me this is an upgrade from my current G5. The good:

- just like the Wingman this mouse fits the hand PERFECTLY. You almost don't even notice that the mouse is there. - The three finger buttons are in exactly the right place. - The smaller teflon feet make it glide much more smoothly than the G5 which tends to pick up dirt more on hard surfaces. - Tracking seems good - on par with the Logitech G5. - The wheel has a smooth, effortless feel to it. - The weights are a nice feature... been done before, but a nice feature none the less. The bad

- Yes the cord is stiff and short. Not a big issue for me since my monitor has a USB hub but... come on guys, if you're going to do it, do it right. - The buttons have a very cheap feel to them. On the original Wingman the buttons had a perfect snickety effortless action to them. These buttons are cheaper, more "plasticky," and reqire more effort to press. Its actually hard to double-click with this mouse. In my mind thats a huge gaming "no-no. "

- The weights, while nice, are nowhere near heavy enough. The G5 gives you at least twice the heft. - Where is the thumb button? Wha? Was this a design mistake? You have to practically take your hand off the mouse and reach back to get to the thumb button. Very poorly done. In all I do really like the mouse. I think a lot of the negative reviews are biased by people who either dislike "Fatal1ty," or are used to the enourmous Microsoft/Logitech mice that you can rest your whole arm on. This mouse has exactly the right idea with some shoddy fit-and-finish work which is really quite a shame. If it fixed those problems I would be stocking up on them and likely would never need another mouse. ADDENDUM:  I have now owned the mouse about 2 months. It has gone completely on the fritz. The buttons have gone to hell. Holding down buttons does not result in continuous motion now but stuttering. The optical sensor has seemed to crap out as well. Movement is now jerky and erratic. This is terrible. I've never even owned a cheap mouse that had these problems. I had to toss it and go back to my Logitech. I still really liked the design and I hope that they can get it right next time.