I own this product for almost a year now, and found it excellent. It has many nice features, very reliable. It doesn't have any interference (unlike my previus Logitech mouse and keyboard) with the other devices, although it's plugged in in the back of my computer, quite far away from keyboard. The keys are very soft.
But first I had a problem. As soon as I installed MX 5500, the keyboard and mouse started to work immediately, but not as they should. The keyboard didn't display the date and time, and the program interface was missing some tabs, including My Mouse and My Keyboard.
So I contacted techsupport by e-mail. They responded quickly and tried to help, but nothing worked. Finally I called them (I was on hold for only couple of minutes), and they said that it was probably a defective product and sent me a new one, without even asking me to return mine!
The new one had the same issue. So I decided to use it the way it was, since in general everything worked, I just couldn't configure it and there was no date and time on the screen.
But recently I found out that there was nothing wrong with the product. The problem was with ZoneAlarm Security suite that I have installed on my computer. Although I was disabling it (as well as the other startup programs) when I was installing the software, it wasn't good enough. The update for ZoneAlarm Security Suite (7.1.254.000 for Vista) had been released mainly to fix incompatibility with the Logitech products. As soon as I installed it - the problem immediately disappeared.
So I'm very pleased with this product and Logitech support. But if you have ZoneAlarm - be sure to update it to the latest version.
Technical Expertise: Tech Savvy
I've used this product: More than a year