Buttons stop working...
351996
The volume and power button stopped working 3 months after I started using this case.  I have to peel off the shell and manually adjust.
2104713
Buttons stopped working less than 2 months, there is not warranty on this unit, so if it dies you are screwed and no one to return to!!!
First Amazon refused to take it back, but because it was packaged and shipped by them, they finally agreed for full refund, I just wish they would tell customers that these units don't come with any kind of warranty.
If I have the receiver in the back of my HTPC the mouse cursor is  jurky and keeps getting stuck from less than 10 feet away,
Very annoying that mouse buttons are backward!!!
3613692
... and the lid no longer works. Tried new batteries, turning off/on, and first the motion sensor went down, and now the buttons don't even work.
4483057
Buttons are not very intuitive.  When it did work it only worked for a day or two.  Then it just quit altogether.  Not worth a penny.
504365
it was working fine when I first bought it but now months later the a, y, and x buttons get stuck at times
2948196
The E, T, O, U, and I buttons do not work at all. Nothing happens no matter how much I click them.

Update: I received a busted unit. The I am receiving a replacement. So, assuming that the replacement, I'll award it a 4. The build quality is really good, but could be better. However, at this price, it's kind of hard to complain
4388778
I enjoy the side buttons, but the middle mouse button shorted out and is now unsuable. Luckily the software for the mouse lets me rebind that button.
800770
Used it maybe 3 times and it no longer works. Replace battery and it shows numbers but none of the buttons function.
3980417
Some buttons don't work
Not sure if need to be program or something
Stylist !!!
4196581
Worked fine for a month until the remote stopped working. Only half the buttons are functional.
1473330
Slider button broke within days; bought 2 and both did the same thing....
117809
some of the buttons do not work - like the add 30 secs. its cost was reasonable.  i would order again but i do not want to send it back for repair.  a hassle i do not need.
1251135
The top row 4 buttons are not working. So bottom row buttons A B RT LT are acting as X Y RB LB.
1724897
It worked great until a few days ago,, The pause button is stuck, It is on, but will not stop
4199403
The perfect mouse, until the buttons stop responding and the pointer jumps all over the screen. Too expensive for that to EVER happen.
2574335
A few Buttons don't work, turns off when trying to program it.
3854143
Certified Refurbished doesn't always been working. Buy with caution as mine has issues with buttons not wanting to work.