Keyboard-OK, Mouse-Dead in 4 months
341311
Bought during summer and by the time of this review (mid Oct), the keyboard is working fine but after an update to Windows 8, the driver could not be updated so i'm currently shopping for a new mouse. In terms of performance, both worked sufficiency but do not expect to be blown away.

P.S. Word of warning for mac users, the lights are not supported.
2251756
I purchased this keyboard in January as a budget replacement keyboard. Everything worked great. It is now August 5... approximately six months later. Just yesterday, random keys stopped working. I removed the keys and made sure the key travel was ok. I dusted the keyboard. I have not spilled anything on the keyboard. I use the keyboard moderately for typing and gaming. Nothing heavy duty. None of the WASD keys or space bar stopped working... random keys like the numbers 5 and 6, the - key, and the left Ctrl key.

For about twenty dollars I expect the keyboard to at least last one year. I do not recommend this product.
3992088
Several of the keys quit functioning completely after 4 months of intermittent and very light use.
514296
Title says it all. It has only been 40 days since I purchased the keyboard and it has already stopped working. The keyboard sits on a coffee table in a house with 2 adults no children or pets and is only used for internet searches on the TV.  Worst quality Logitech product I have purchased.
1234307
the hardware just stopped working last week. its been exactly 4 months. MadCatz is out of business. the mouse looks awesome and was so much fun to use but im afraid i just wasted $70 if amazon won't refund me.
4728506
I have owned this combo for less than 1/2 a year keyboard works fine but the mouse on and off switch has a problem and causes the mouse to become useless. Great product if you only need it for six month's
4746057
I actually liked this keyboard, but after only 6 months the Backspace-Key (and only the backspace key) stopped working.  For the cost of this thing, it should last much longer than a $20 Logitech, and I can't find any obvious way to return it.
2298026
Wonderful keyboard! If it stays in working condition. 4-5 months in, the windows key starts to register as a control press. I dismissed it since i was remapping my keys with autohotkeys and thought it was a script error. But NO! even after removing all scripts it still acted up and plugging it into my laptop gave me the same results :(. OK maybe the manufacturer can help? NOPE. Tried to contact them three times without so much as a confirmation email. Complete radio silence from the manufacturer, they'll probably get back to me once the warranty period is over. Luckily Amazon came to the rescue! If i could leave a separate review for Amazon as a seller they would get 5 stars. 5 min chat with a rep and I got a return label. Didn't even have the original box. (hey i expected a good quality keyboard for ~$70)
2004213
Good keyboard... until it stopped working. Worked for half a year, then would occasionally stop responding, unplug/plugging usually "fixed" it, but then it was just dead.
380076
G Keys stopped working after 2 months of use, had to completely disconnect from main board due to ongoing issues.
974971
Very nice keyboard and mouse. Comfortable and installed instantly with Windows 7 Ultimate x64. DPI adjust on mouse is very convenient. Keyboard keys are pretty quiet (definitely not a silent key however) and overall comfortable to use. Only 3 stars because it lasted about 3 months until volume keys stopped working, along with Enter and Esc (no spills, drops, etc.) I'm a computer technician, and after troubleshooting for a few days I determined it was just a bad board. I decided to buy this set [...] to replace the keyboard. So far everything is working great, I'll update in 3 months if theres an issue.
714723
The mouse is fine. It mouses. No complaints.

But the keyboard is sketchy. It wakes up after you type the first few keys, and that takes a second or so, and so it always misses what you type at first. It also drops out randomly, depending on the distance from the dongle. I use this for a living room PC, and so the distance between the dongle and the keyboard can be up to 6 feet, and it can't do that. I changed the batteries, and the issue persisted.

I bought a Microsoft keyboard to replace it. The jury is still out on that one. I had an HP before, and that worked great, until I broke it in a freak accident.
740740
This mouse started double clicking within 4 months...Low Quality Product by Steelseries...Avoid.
1276999
After only a half year of infrequent use, e - key stopped working.  Since this is a frequently used key, I need to dump this keyboard. Too short life for a $50 keyboard. I am writing this by using another computer.
850364
This is almost the only game in town for a dual monitor setup using DVI and VGA from the computer.  The box worked for about two weeks and then suddenly the keyboard and mouse stopped working on one side of the switch.  The LED just flashed but nothing even after extensive debug.  Amazon was great as usual and swapped out the unit.  The LED still flashes like there is an error, but at least the keyboard and mouse work now.  It's possible I still have something messed up... but this isn't rocket science so I kind of doubt it :)
3388338
They keyboard is nice but I expected the mouse to last longer than a day. The scroll still works but it squeeks loudly after one day of use. I have a feeling this is not going to last long at all. I expected better, even if it is budget.

update: The W key is becoming unresponsive. =(

second update: The keyboard totally shorted out and I had to unplug it from the PC or risk damage. I would not recommend this combo.
2374604
2 months later the keyboard drops letters in every sentence