At ~£18 this certainly isn't the cheapest case on the market but it's certainly worth the price. Why? Well this case does exactly what it says whilst also looking and feeling good.
As the title suggests this product should protect your phone from knocks. I have owned my Nokia 5230 for 18 months now and due to having this case it is still working with no scratches even though it has been dropped on pavements, tiled floors, dirty ground, etc. I think that the price is worth having a working phone as it saves money in the long run. The product description will tell you that the corners are made to dissipate the impact away from the device and well something must be working for my phone to still be alive and well. As for the case itself the silicone does not scratch very easily and marks come off with a wipe of a wet cloth.
As the case is made from silicone it fits very close to the phone and therefore as you use the phone with the case on you don't get any slip and the feel of the product is solid. Personally I also prefer the feel of a silicone case to a hard one as it gives you more grip so you are less likely to drop the phone or have it slide off of a surface.
The case is very easy to take on and off - which is good for cleaning if something gets under it. Just bend the case on or off in seconds. There is nothing to break or snap as the case is one piece. When the case is in place you can access all the buttons and holes that the phone has so functionality is not reduced.
The case is black which is good as it matches the phone (phone available in black and white to my knowledge). The case fits well and looks as it matches perfectly. Personally I think the case looks very stylish and not too bulky like competing products. The case has a marking with the brand on the back of it but is otherwise plain and simple.
Okay the case isn't the cheapest on the market, but if you want to protect your phone properly, in a stylish, comfortable and easy to use case; I would definitely recommend this product to you!