Instruction: Generate an answer to the question by utilizing the information contained in the document.

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Question: Will this degrade the picture quality by using a switch like this??
Document: Gets the job done if you don't care about video quality. This box will have your HD images looking like someone smeared Vaseline all over the picture. I made the mistake of assuming a powered switch box would work better than a manual one. The truth is that my old manual unpowered component switcher kept images sharp and did not interfere with the audio quality of what I was playing/watching. Bluray movies and games in crystal clear HD is what I got with the old box.
Nothing fancy, just work like it should.Using it to switch between Xbox 360 and WiiSimple.Would recommend for others needing to do the same.
I have been using this switch now for 6 months and it performs well. Be advised that this product only supports digital audio cable and won't work with fiber optic audio output. This was not a problem for me as I am running audio straight to the reciever and just needed this switch for video. I have not not noticed any bleed through from any of my other components. the only negatives are that the channel light is very bright and the remote looks like it is straight out of the 70s.
Shipping was fast and it looks just like the picture. I didn't realize it didn't come with any cables. I should have read the description more carefully so that's on me. I had to order cables which will come in a couple of days. I have one  component cable and I got a component set for my Wii so I hooked it up and it works well. I'm sure I'll be happy with the unit, but I can't fully test it until I can connect more than one item to it.
I first bought this switcher for its intended purpose, selecting one of four component-video inputs with stereo audio, and have always been quite satisfied with it. I like it especially for the video quality and value.
I have a pre-HDMI TV set, and ran out of Component inputs. This box works exactly as advertised, and appears to give an excellent quality signal. I use all 4 inputs, for Uverse box, DVD, XBOX360, and Wii. I'm using both the analog and coax audio connections, and all work great.
Even upgrading to higher quality cables could not save this box. Only buy this trash if you currently can't afford to do better. Either avoid it or use it as a stepping stone. Switcher boxes have improved in both quality and price over the past few years and you can definitely do better than this. Just imagine, they originally wanted like $50 for this. Funny.
PROS:  IR learning mode worked great.Manual switching works also.After a few minutes warm up, "pops" when switching sources disappeared.CONS:  In my very revealing audiophile level system, I could definitely hear degradation of the sound when using this unit. Vocals especially took on an added "graininess", they were less smooth, "rougher" if you will. This was noticeable and unpleasant and I immediately gave up on using this unit for highest quality audio switching.
I was very pleased with this product and as advertised simple to use. Picture and audio quality was excellent and no problems with the switching between different devices. Thanks
Had no problems connecting the cables to multiple devices. Switching inputs with the IR remote works well with little delay between input detection. Picture quality is just as clean from before and the whole unit tucks away nicely.
Answer: For what it's worth, I think any device between the source of the signal and the destination of the signal will cause at least some degradation whether it's audio or video.  I'm 66 and wear glasses and I was not able to perceive any difference on my plasma HD tv.  I pipe my satellite signal, 2 blu-ray players and a dvd player through my Yamaha receiver.  I am not a purist and with my equipment, the audio and video are just fine.  With top-end equipment and eyes that work better than mine, there might be a visible difference.  I hope this helps.