OK...two things first:
1. I hate mice. I will graciously refrain from an extended rant (here at least) about Logitech's insistence on bundling mice with their keyboards. Why the people who make the best trackballs and keyboards in the galaxy insist on stuffing a crappy mouse in the box is beyond me. Listen up guys! If I wanted a mouse I woulda bought a mouse. It's a pain in the bleep to pay for that thing and then toss it in the trash to make room for the Cordless Trackman Wheel. GRRRRRRRRRRR!
2. This is not the sooper dooper does everything but get up in the morning and make coffee keyboard that costs [...] bucks and takes up half of your desktop. It does do some interesting stuff if you are willing to mess with the Function keys but, if you really want that sort of thing, invest in a bigger unit.
That said, this is an excellent keyboard for what it is. Which is to say: small, light, well built and minimal (and cheap, of course). My desktop space is very limited (also one of the reasons I do wireless trackballs instead of mice). This unit has all the basic keyboard/numberpad keys and none of the extras that infest the larger multimedia/gaming keyboards. What it has is full size, not scrunched down like most "mini" or laptop keyboards. The keys have a nice tactile feel. It does what it does very well. It would make an excellent external keyboard to lug with your laptop or netbook if you need one.
I dunno about battery life yet: I've been using it daily for 3 months and it hasn't died yet. If it's like my other Logitech wireless keyboards it should go 6 to 10 months.
The only "con" is that the legs are too short. Even extended you are working on an almost flat surface. I added a set of Laptop Legs to get it up to a better typing angle. YMMV
As for the mouse...well...it won't take up too much room in the landfill. :)
Average Rating:

Brand: Logitech
Color: Black
Model: 920-000879
Product Description:Now it's easy for anyone to enjoy a great cordless keyboard and mouse. The Cordless Desktop EX 100 is affordable, simple to set up, and provides an ideal combination of features that make everyday tasks smoother and more fun. Adjust audio volume, launch your web home page or your calculator with conveniently placed buttons on your spill resistant keyboard. The cordless optical mouse lets you work smoothly and freely on almost any surface, and features a mouse wheel that lets you scroll documents with more control. Your work space will be easier to manage too.
Features:
- Free yourself from wires with the Logitech EX 100 Wireless Standard Keyboard and Mouse.
- The wireless mouse eliminates the mouse-drag, reducing strain and increasing productivity.
- Whisper-quiet keys and glossy-black highlights.
Format: CD
Available at Amazon
List Price: USD 29.99
Lowest Used Price: USD 17.04
Lowest New Price: USD 19.99
Lowest Refurbished Price: USD 14.99

Customer Reviews

Great product with some strange features
I used to have an older model of the Logitech wireless keyboard and mouse and was looking for a new version. The main differences compared to the older versions:
+ very nice slim keyboard
+ smooth and silent typing
+ more sensitive laser in the mouse
- for some strange reason you use AAA batteries in the keyboard (I guess to keep it slim) and AA batteries in the mouse - I have rechargable AAs so now I need to buy AAAs
- the left button of the mouse gives an annoying creaking sound anytime I press it, but I hope it will go away

It does the job, sort of...
If you've ever used one of the old WebTV devices, this will feel fairly familiar to you. It's small, spill resistant, and feels fairly durable, but after a few uses you'll be wishing for more.
The Good:
1. Small, yet full keyboard including full numeric keypad.
2. Fairly quiet key action
3. EXTREMELY EASY SETUP! Plug in the receiver and you're up and running.
The Bad:
1: Feels cheap after getting used to it.
2: Mouse battery drains unacceptably fast.
3: The mouse scroll wheel is very rough and choppy, and actually "clicks" when you scroll. I would have liked to see a smooth wheel instead.
4: Mouse range is very poor at around 4-6 feet. The keyboard drops out of range around 15 feet.
Overall, this isn't a bad keyboard for very basic usage, or for the little kids, especially at this price point. However, if you're looking for a good quality everyday keyboard and mouse, you might want to consider alternatives like the Logitech MK 300 or better.

you get what you paid.
The cordless keyboard is one of the cheapest you can get from Logitech, its very cheap, the keyboard slim and light (with battery), it also feels cheap, I did like the short cut key to check the battery (not find in any of my other Logitech cordless keyboards, wave and the diNovo. Perfect for the kids, don't have to worry about spilled milk or other liquid, because its cheap enough to replace. I got mine 50% off from another store w/speakers. I don't recommend this to anyone if they can spend a few more $ on a higher model. But for a kid, this keyboard is perfect.