In regards to the PSV2K series L2 R2 grip, I have mine currently and while its nice and works, there is 1 small issue with it, which might be serious for some. That and not being able to use a case obviously.
After feeling the plastic and how it fits in, the areas circled in red in the image below are weakpoints that feel like they would have a high probability to snap off if a user is constantly trying to take out / put in their PSV.
That and dont expect to fit this in any sort of case, so if you are planning on getting / using one you better have a screen protector on. As with the issue stated above would not recommend taking the vita in / out of the housing.
Not really the best design considering the price of the thing. Damned shame too since the case itself and triggers do work.
The reason why I say the plastic is most likely the brittle type is I used to build a lot of different plastic models and you can get a general feel of the different types and their durability by their texture and just pressing around on things lightly. Most def this feels like the more brittle type that is not good under stress and will snap into sharp pieces rather than being more flexible. One example of this is like Gunpla vs. Older Kotobukiya models. The quality of the plastic is 2 totally different things. Gunpla plastic is more pliable while the stuff Kotobukiya usually uses is more brittle.