Does a VGA Switch reduce quality?

[Jpac]

Hi, I am aware that any add-on reduces quality a tiny bit, almost innoticable, but does this greatly reduce quality like a splitter, or does it simply just make it convinent to switch between the two?

Thanks

Also, is this one good? One makes one good..

http://www.amazon.com/gp/product/B0...ref=sr_1_9/104-7574306-3052728?_encoding=UTF8

 

[LNCPapa]

They definitely can reduce the image quality, but it's highly dependant on the resolutions you're going to run. Usually, the higher the resolution the more noticable it will be. I'm not sure if this holds true for a DVI switchbox though.