I bought the PS Vita official starter kit for £20, which was a pretty good waste of money.
The slip case is no good for protection against anything but dust and scrapes while it's sat on the side, you cannot realistically use it for transporting the Vita, and if using the wrist strap, the pouch does not sit closed properly.
The Leather case is great providing you do not want to protect the sides, but protects the screen and sticks brilliantly. The front half of the cover has a raised section in the centre to protect the width of the screen, while the joysticks are untouched, but protected by the cover. Hard to describe. I have to admit, this was the main reason for buying the kit, as I wanted to protect my Vita on the travel to and from work. I do not feel it is adequate enough. I was also hoping to be able to store one or two games in this case so I didn't need to carry the standalone games case too, but it doesn't.
The screen protector promises to go on brilliantly thanks to placing a template over the right hand buttons to make sure you place the protector properly. Unfortunately, it still didn't go on straight.
The wrist strap is a wrist strap, and the game case is a game case....
I ended up buying the
Thrustmaster Uncharted Shock Resistant Case (PlayStation Vita) instead, which suits my needs far better.