this mouse was defective and I had to return it
Do you have a price for a shoes?
I purchased this mouse (not from Amazon) to go with theLogitech K350 2.4Ghz Wireless Keyboard.  Both use the unifying receiver so one receiver for both keyboard and mouse- yay!  Or so I thought...  Unfortunately, this mouse was defective and I had to return it.  Due to the poor quality of the mouse I received along with other reviews having similar issues, I decided to go with a different mouse then to try my luck again with this one.Issues:Did not track accurately.  Tracking is sporadic.  It would appear to work properly, then not at all.Did not click accurately.  Had to click several times for the mouse to work.Tried changing mouse pads, no pad, putting a piece of paper underneath.. nothing helped.  The logitech software was the current, updated version.  What's sad is that when I went to return it, the tech at Staples (where I bought it) tried to test it and it wouldn't even work on his PC.  At least on mine, it somewhat worked.  The tech's PC did recognize it and yes, the mouse was turned on.  The pointer just wouldn't even move.I had major challenges with finding a mouse to work for my needs.  I finally settled on this one due to the following:Right size for my small handsErgonomicSomewhat ambidextrous.  I am left handed but typically use the right hand for the mouse (gee I wonder why that is.. gripe, gripe, gripe about the lack of good left handed mice!)  I could get away with using it in my left hand if needed (due to nerve pain I have to switch between my left and right hand as needed) but not for long term use.Had the unifying receiverFeatures: Had all the features I could possibly want or need.  I loved the hyper scroll and application switcher.  The buttons were unobtrusive and I never hit them unintentionally.I tested several other unifying receiver mice made by logitech and this was the one that fit my ergonomic needs the best.  TheLogitech Wireless Anywhere Mouse MX for PC and Macdoes have a good selection of features but it was too small.  TheLogitech Wireless Performance Mouse MX for PC and Macwas too big and not at all for left handed use.  TheLogitech LX7 Cordless Optical Mouse - Dark Blue ( 931395-0403 )is my backup mouse and is OK and theLogitech Wireless Mouse M505 (Black)was the next choice if just going off of ergonomics and comfort, but for the price and lack of features I decided to look outside of Logitech.What I found instead was theMicrosoft Explorer Mini Mouse.  This mouse fit similarly to the M705 and it is MUCH lighter and MUCH cheaper!  It also works better in my left hand then the M705.Like I said in my title, I wanted to love this mouse but it was so defective I didn't even want to try a second one. If you want to play roulette to see if you don't get a defective one (seeing some reviews I'm not the only one who got a defective one) then here's my pro's and cons list:PROSErgonomicComfortableUnifying ReceiverApplication SwitcherHyper ScrollUnobtrusive specialty buttonsCONSHeavyNot ambidextrousQuality (if you're like me it will be defective!)I hope this review was helpful!  If you suffer from nerve damage in your neck, arms and/or wrists (like I do) I ended up with theLogitech K350 2.4Ghz Wireless KeyboardandMicrosoft Explorer Mini Mouse.  I do graphic work from my PC and play computer games.  So far both these work perfectly.  The only down side is that I now have two wireless receivers on my desk rather than the one.  Good luck in your mouse search! 