Below is a somewhat unabashed knock-off of a similar list in my Diamondback review. The reason, though, is simply that many of the same comments apply to the Copperhead (which is a good thing). I've also pointed out some major differences now found in the Copperhead.

• The most noticeable addition is the pulsating serpentine Razer logo on the top of the Copperhead. It's just "bling" but cool all the same. You can click the image below to view a video of the pulsating in action (DivX format).

  Pulsating Glow

   
• The Razer Copperhead follows an ambidextrous (symmetric) design while the main competition in the Logitech GF is strictly for right-handed use. Symmetry of the Copperhead takes some getting used to and it does feel a bit odd compared to right-handed mice. I did get used to it pretty quickly though and liked the feel, albeit different. Compared to the Diamondback, the Copperhead feels a bit better in my hand as it has a slightly taller arch to the body.
   
• The Razer Copperhead's two main buttons have a rubber coating which offers a better feel than slick plastic or metal. These buttons are also contoured in a concave fashion so your fingers rest in the with a very natural feel. Compared to the Diamondback, there is no difference in the shape, size, or feel of the buttons.

  Top View

   
• Some folks like to have an area "rim" near the buttons of a mouse where they can rest their fingers (instead of resting them on the buttons themselves). There is a rim area on the Copperhead but it is smaller than the area around the buttons of the MX700. So, if you're the type that likes this resting area it's there but just barely. Compared to the Diamondback, there is no difference in this area. I've grown accustomed to resting my fingers on the buttons and have no accidental clicks. Actually, this seems to be one of the strengths of the Razer mice's accuracy as you're really moving the mouse with your fingertips instead of your palm. Anyone that's ever played basketball, baseball, etc knows that fingertip/wrist (and not palm/arm) control is the key to accuracy.
   
• Overall, the feel of the Copperhead in my hand did feel smaller than my previous mice. This is mostly due to the fact that there is a fairly distinct difference in height (or thickness I suppose) with the Copperhead being not quite as "tall". This wasn't a big deal to me though and I quickly got used to it. It weighs roughly 25% less than the Logitech MX700 which is 175 grams (6.2 oz.) Compared to the Diamondback, there is no difference in this area. The Copperhead does "seem" to be about an 1/8" shorter in length than the Diamondback (measured with a string to follow the contour of the body housing). However, the dimensions stated on Razer's website are exactly the same for both the Diamondback and the Copperhead:  Size: 5.04" length x 2.5" width x 1.54" height

  Side View Diamondback in foreground. The higher arch of the Copperhead can be seen in the background. (that is not a shadow)

  
  

  Back View Diamondback (left) Copperhead (right) The higher arch of the Copperhead can be seen here. You can also notice a height difference at the very bottom of the base area.

  
  
• The scroll wheel on the Copperhead is even better than the Diamondback's. The wheel is about the same size but it has more defined "ridges" on the wheel surface and also slightly stiffer tactile feedback which I loved. The wheel has a flat feel to it unlike the slight peak as most other mice do.
   
• I wasn't crazy about the side button placement on the Diamondback but I actually think it was better than the Copperhead's. It was really a mixed bag for me. The Copperhead side buttons are further down towards the base/bottom of the mouse and a bit more towards the back. I like how the Diamondback's side buttons were up higher and more towards the front...would have even preferred them further towards the front of the mouse so I wouldn't have to bend my thumbs as much. The Diamondback's side buttons were really a single "rocker" style button which I never was crazy about. The Copperhead's side buttons are now actually two separate buttons which I feel are an improvement over the Diamondback. This is all very subjective of course so what I don't like you may love. It will just vary widely from person to person.

  Side Button Placement Changes

  
  
• This thing is smoooooth. The 2000 cpi, up to 1,000 polling rate, and 16-bit data path appear to be much more than marketing-speak. At first use it actually felt a bit too smooth but you have an amazing amount of control to tune this to your liking via the Razer driver software. The Zero-Acoustic Ultraslick™ Teflon feet were a nice touch as well.
   
• Once I actually spent a few hours gaming with the Copperhead it actually felt very similar to the Diamondback. There was a noticeable improvement with the Copperhead though; it did feel smoother and more accurate. It's impossible to really quantify this though as everyone will be different in how they perceive gameplay with any given mouse. I could make headshots (at a good distance at that) in Doom 3, Half Life 2, and the F.E.A.R. and Call of Duty 2 demos with an uncanny ease.
   
• The new additions of 32KB of onboard memory is a really nice and usable touch as you can save your profile settings right on the Copperhead itself making it portable between different machines.
   
• The "grippy" material around the sides of the Copperhead are the same as the Diamondback. However, it has a more pronounced edge to it which I felt was a nice improvement in the overall feel of the mouse in my hand.
   
• I'm curious to see what the upcoming "Copperhead Toolkit" will offer. Razer's tech support was quick to answer my questions and stated the following:

Some people do not want the side buttons to be active. To prevent them from being active we provide dummy buttons that can be used to make the standard ones inactive. The dummy buttons come in the Copperhead tool kit, available separately. Please keep in mind that opening the mouse to insert the dummy buttons will void the warranty.

The weights will be applied on the inside of the mouse, and will be supplied with custom coloured cases as well as dummy side buttons so that the buttons can be converted such that they cannot mechanically actuate (even though they can be permanently turned off using our Synapse system).
 

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