Pros 1. Under Thumb Button. Feels just great.
2. Charging via USB cable. Convenience and Portability.
3. USB Receiver - Tiny, and Flexible.
5. Darkfield Tracking Tech. I can now buy a glass desk..... good?
Cons 1. Taller Shape (compared to the MX Revolution I've been using) It has a big butt, everyone should of course try it for themselves.
2. Forward and Back Button Placement. The forward and back buttons are above the Zoom button... kind of high for me.
Summary I think the combination of nice buttons, hyperfast scrolling (a must for me now), excellent tracking, tiny receiver, and convenient charging makes this a winner.
I also made a comprehensive video review and comparison to the MX Revolution that you can watch if you'd like -> http://www.youtube.com/watch?v=HWJ1AyP5i44
Pros What is there not to like?
-Runs on a single rechargeable battery with good batter life
-Great design and mucho buttons to personalize to your computer
-Darkfield laser enables use on ANY surface
-Hyperscrolling function is irresistable
Cons None really. But if I had to list a potential issue, then maybe a portable traveling case would be a nice addition. Also, a little mini storage compartment inside the mouse to house the micro usb reciever, similar to the vx Nano, would be nice.
Summary So, this is the first high end mouse I've purchased. Up to this point, I've been getting around with my apple mighty mouse. I use a macbook pro laptop by the way. Lets just say the difference between the mighty mouse and the mx performance (MXP) is night and day. Not only is the tracking smoother than a baby's butt, but the almost flawless ergonomic design only adds to the elegance of this mouse. I feel like royalty when using it. I don't know what the previous user reviews experienced with their mouse, but mine works perfectly. Installing the software is hassle-free, especially with regards to Mac OSX Snow Leopard (very intuitive and easy to work). I've had this mouse for about a week now, and have been using it hours on end and still haven't had the need to recharge it yet. And when I do need to, I can just hook up the micro usb cord directly to my computer and use it like a wired mouse while charging (another well thought out design addition). The battery indicator is also a nice touch to let you know the remaining charge. The MXP fits my hand perfectly, and I've had NO problems with any lag-time between uses (it doesn't fall asleep on me and take 5-6 seconds to wake back up, like stated in previous posts). I've also used this mouse on a bunch of different surfaces (glass, wood, countertops, etc.), and can definitely vouch for the versatility of this mouse. It seriously works consistently perfectly, regardless of the surface it's used on! This is an amazing mouse, and worth every penny spent. If you like logitech mice, and are in the market for something with excellent performance, solid design, and flawless tracking, then this mouse is for you.
Pros The feature about working on glass (darkfield) is phenomenal. Great feature. It should be in every wireless mouse.
Cons The mouse clicks a little more "hollow" than I'd like it to. An expensive mouse usually has a solid feel (like the MX revolution). I like the click to stay in the button and not reverberate through the mouse. This one reverberates.
Summary For the price, the MX Revolution is my choice still. This one clicks hollow, and while it does mouse on glass very well, that is not enough to counterbalance the losing of the solid click and the loss of the side scroll.
Pros Comfort, looks, extra buttons, set point software.
Cons Wireless lag and dropouts.
Summary I really, really wanted to love this mouse. After reading poor reviews of the MX Revolution (mostly related to the wireless lag), I thought I had hit the jackpot when I discovered this mouse. Logitech claims the "improved" wireless technology provides "virtually no delays or dropouts". Not so. When I first hooked it up, there were multiple delays (1-2 seconds each). Then all of a sudden, it started working great--no delays at all! Until about 10 minutes later when it dropped out completely and stopped working. Awesome. A $100 paperweight. So, it went back in the box and back to best buy. I picked up a wired MX518 instead.
For those wondering, yes, I am running a wireless 2.4 router in my house. Should that matter? No. How many people in the US alone are running their internet connection off of a wireless router? Ridiculous.
Pros -USB Charger
Cons -No more thumbwheel
-Back/Forward button placement
-Feels a bit cheaper than the Rev
-Loses ability to customize scroll wheel per application.
Summary Frustrating. This adds everything that was lacking in the Revolution (i.e. Smaller dongle, USB charging as oppose to a dock, and Darkfield), but sadly this comes at the expense of many features that made the Rev great. (i.e. Thumbwheel, button placement, customizable scroll wheel per application)
The Perf buttons and frame also feels a bit cheaper than the Rev.
Maybe in a few years Logitech will combine the best of both mice, then I'll be in heaven.