Ordered this, not initially realising it was designed for the PSVita Slim. Surprisingly, it seems to fit my standard model quite nicely. The silicon case fits quite snugly around the Vita, and the hard case offers a rather secure fit, even with the silicon case on. The screen protectors were decent too (I did notice a very tiny scrape on the front screen protector when I put it on, but I can't see it when I'm using the Vita), and the game cases were handy as well.
The only way I could see this being improved on would be if the silicon case had markings on the buttons, as these cannot be seen clearly through the case. This was a very minor gripe from me, however, as I barely even look at the controls when using them, being more than familiar with where each button sits.
All in all, amazing value for money, and would recommend this kit to anyone looking to protect their Vita.