I ordered this from Kikatek. I connected this to 3 PCs, 2 Windows 7 and 1 Windows XP. I also connected the front two speakers of my 5.1 setup to the KVM. Works fine from Windows XP and supports my monitor resolution of 1920x1200@60Hz. The only problem I had was that windows 7 wouldn't recognise my monitor and kept showing it up as a none plug and play monitor. Because the monitor wasn't recognised, I couldn't get the full screen resolution and was stuck with windows 7 running at 1280x768. To fix this I went into device manager> right click the none PnP monitor>Update drive> Browse my computer for drivers>let me pick from a list of drivers> I then get a choice of generic PnP monitor and none PnP monitor. Once I select the PnP monitor I can set the right resolution.
The sound works really well with the two PCs that run stereo and also with full surround sound from the gaming PC. I don't get any distortion or hiss from any of the PCs.
Switching between PCs was a little different to what I was used to. My old two port Aten KVM requires pressing Scroll Lock twice to switch. This one requires me to press Scroll Lock twice and then enter to move from one PC to the next or Scroll Lock twice and then a number from 1 to 4 depending on which PC you want to switch to.