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I've only been using the keyboard and mouse for a couple of days, but am pretty happy so far. My MX 700 isn't having any trouble on a semi-glossy table top and the range is nice. So far, the only problems have been these:

1. After installing software from included CD-ROM, mouse stopped working (I assume an issue with microsoft mouse driver or old mouseware compatibility, not sure). I restored my setting and downloaded the newest mouseware from logitech indivually and it worked fine.

2. F11 and F12 keys are supposed to go to "My Pictures," and "My Music" respectively, but they are instead linked to "Owner's Pictures," and "Owner's Music." Running XP with different users, I want the F11 and F12 keys to be user specific. I have contacted Logitech and will update if the problem is solved (I have downloaded the most recent i-Touch software).

Overall, a very nice product so far. Even if the F11/F12 doesn't straighten out, I would probably only drop to 4 1/2 stars. Nice design and functionality. The mouse is ultra usable in that all 8 buttons are useful.

*****UPDATE--Problem worked out. Under configure for F key, had to choose "open folder" and another pull-down appears to let you browse what you would like to link to an F key. Also, logitech customer service was surprisingly friendly and useful.

My Optical Intellimouse suddenly dies one day. I think it was the cable because fiddling around with the cord would intermittently make it work. But I digress.

I have been eyeing the Logitech Cordless MX mouse ever since it came out. But I always thought it was too expensive. But since they paired it up with the their Wireless Elite keyboard I was sold (Maybe my mouse dying was a sign). I have been thrilled with this product since purchasing it about 4 months ago. The MX mouse works like a dream. It feels heavier than my old mouse, but you get used to that real quick. It's also just as smooth and accurate as my corded optical mouse. And I love not having to deal with the cord. The keyboard has a real solid quality feel. The zero-degree tilt took a bit of getting used to, but that also didn't take long. I love the one-touch and media controls. In effect I can use my keyboard as a remote control for my TV tuner card.

In terms of range and battery life, two very big issues with wireless keyboards, I've used my keyboard and mouse while sitting across the room on my sofa in my office. No problems whatsoever at a distance of about 10 feet. I'd say my computer is used about 2-4 hours a day. I have never had to change any batteries either since I bought it. The keyboard comes with alkaline batteries and the mouse is rechargeable in its base. Plus it works fine with my Cybex KVM switch.

Dislikes? Maybe minor gripes really. But the volume knob on the keyboard isn't as linear as I'd like in terms of controlling the actual volume. I still find myself using the volume knob on my speakers from time to time. Also I would have liked better control of setting the one-touch keys. Not all of the one-touch keys can be set and some I can't really get to do anything. But I don't really use these keys much anyway so no big deal. Finally I would have liked to have a caps lock LED on the keyboard where you'd expect. The caps lock LED is actually on the mouse cradle. Again all minor gripes for what is absolutely a first rate product.

I decided to get the MX duo after reading all the good reviews here because I was looking for a nice wireless combo but after a few weeks it's proven to be somewhat of a let down. Here's the lowdown:

Good:
* The keyboard has a decent feel to it, and the mouse has no noticeable lag.
* Rechargeable mouse battery
* Some of the shortcut keys on the keyboard are nice. The only ones I use are the volume control and mute which are very nice to have at your fingertips.

Bad:
* All the other keyboard shortcuts which I never use. It makes the keyboard much bigger than I'd need. I hardly ever listen to CDs, the controls for which take the entire top center of the keyboard. Then theres a bunch of other garbage like search, shopping, favorites, webcam, etc which I've never touched.
* There is no indicator light on the keyboard for when you have caps / numlock on which is VERY annoying. There are, however, indicators on the recharger but it's way in the corner of my desk (they say it should be kept 3 feet from all other electronic devices). Any place I put it still makes it exceptionally aggravating to have to look over to see if I've accidently hit caps lock. Supposedly the software has some kind of indication that pops up on the screen, but I opted not to install the software because I didn't want all the stupid stuff they bundle with it. How hard is it just to keep the lights on the keyboard itself? If it aint broken...
* The battery life for the mouse seems to be about 4-5 days. But the worst part is, unlike mice with cord chargers, you can't use the mouse while it's charging because it's sitting the in base station. So you're SOL if your mouse dies while you're working. Keep your old one handy if you buy this set.
* I keep accidently hitting the "back" navigation button on the mouse which gets annoying too. It's big and right where your thumb can accidently press it.
* The mouse speed takes a while to get used to. Changing my mouse settings either makes it a little too fast or a little to slow.

I give this product 2 stars. It has its virtues, but overall I think Logitech tried to make it "too cool" without considering the design consequences. Save yourself some aggravation and pick up a different set.