I've heard of and seen issues with IOGear USB KVMs and Keyboards and mice. 
Specifically if you just have a keyboard with special keys or a mouse with more 
than 2 (or maybe 3) buttons, the extra features stop working through the KVM. 
This is because the IOGear KVMs just send a generic keyboard and mouse ID rather 
than the one for that keyboard and mouse to the computers connected on the far side.

> I use and have used IOGear products with no problems.
> 
> rmelder@cheerylynn.com wrote:
> 
>> Does anyone have any experience with digital KVM 
>> (Keyboard/Video/Mouse)? I'm
>> looking for a four port that will sync well between my windows and linux
>> boxes. I'm wondering if there are any to stay away from? Any
>> recommendations?
>>
>> Linux/Windows refresh rate sync problems?
>> USB support problems?
>>
>> Thanks for any help you can provide!