Here's what I did to "fully" protect the Vita while still retaining it's form and function 100% (as in not putting on a hard case):
1. Put Hori filter on
front
(
http://www.amazon.com/gp/product/B006VE40JQ/?tag=neogaf0e-20 _
2. Cut about half an inch off of the top or bottom of the Sony filter (you get 2 in pack, so you can mess up once)
(
http://www.amazon.com/gp/product/B006PP404Q/?tag=neogaf0e-20 )
3. Apply the cut Sony filter to the
rear touch pad
Holding and playing Vita now feels a lot more "safe". I felt very erm, dirty putting heavy use on the system with no protection before this.
Another reason I think the Hori is superior, is due to it covers the whole front instead of just the screen. So with the Sony for example, your finger (when swiping between LiveArea screens for example) will hit the "bump" of the protector's edge a lot, while with the Hori, it's all one clean, flat surface.