I know that this product is very cheap, but there's a reason for this; it's no thicker than a carrier bag. It also sounds like someone scrunching up a carrier bag with any movement, which would not be good if your child isn't a very good sleeper.
Like most of the mattress protectors this has to be hand washed, although you can get a machine washable alternative at a higher price. I have had to hand wash this item a couple of times after minor leaks and it already has some small rips in it and will not see us through until my daughter is totally nappy free. I can't testify as to its ability to cope with bigger accidents as my daughter is in night time pull ups.
I am really amazed at the enthusiastic reviews that some purchasers have submitted. Unless you are just looking for a cheap stop gap, and have a child that you think will be OK with the noise, I would personally recommend that you spend a few extra pounds to save money over the longer term and find a better alternative product.