I was also looking for a way to have my Xbox 360 and PC connected to the same screen. Went into a computer store and it was going to cost me £50. Looked on here and found this product and it was £8.99 with delivery. Thought it was definately worth a try.
Ordered it on a Sunday, and it came on the Tuesday, and it was standard delivery so cannot complain at the service.
Plugged it in, turned everything on, and it worked really well. Extremely easy to set up, and overall a really good product.
I read the other reviews of this product, and made sure I had the high quality cable going from the switch to the screen, and the not so good quality cable going from the switch to the PC. Have an excellent picture on the Xbox, and a very good one on the PC, has a slight blur to it, but doesn't make any real difference to the picture, as I am more interested in getting the best quality picture on the Xbox.
So if you need a cheap, and easy solution to have two things plugged into a screen (Xbox and PC), I definately recommend this product.