At the time of writing this review, the PS Vita just debuted in the US and the choices for protective screen films are limited as one might guess. I haven't tried the product from HORI, which was what I wanted to use, but Amazon's estimated ship date was over 1 month out when I ordered.
So, comparing this film to the quality of the dozens of iPhone and iPad films I've used, I would rate this one _almost_ right up there with my top favorite, the Power Support matte finish film. This Sony-branded film is a shiny finish, not matte, which works better for video and games, but if you want to use a capacitive touch stylus with your Vita, you may find that the friction is a little strong. (In this respect, it is similar to lower quality films for iPhone. I tested with the Wacom Bamboo Stylus and the Griffin stylus. As on iDevices, the Bamboo has a quite a lot less grip than the Griffin.)
Installation was simple and included very easy-to-follow directions. Each film is a 3-layer treatment, with the bottom layer being pulled back to expose the cling of the actual film, the second layer the film itself, and the top layer was an interesting and impressive guide layer with cutouts for the buttons and right stick so that even a new user of capacitive touch devices and film protectors can easily apply the film in exactly the right spot. Still, I found it easier to do it the old fashioned way. I can't think of any reason not to recommend this product.