Wish I had bought it last year!
As @gohan says, if you own a PS4 and a Vita, you need this case. The difference in Remote Play experience is amazing.
The sad truth is that PS4 game designers just don't test their games with Remote Play in the past few years. If they'd spend even 10 minutes trying to play their game, with 2 or even 3 "button presses" on the back touchpad at the same time -- hold L2 to bring up your weapon, click R3 to zoom, now R2 to fire, all while trying to move and aim with both analog sticks -- they'd never have shipped without controller customization or at least a sensible dedicated Remote Play scheme. That clearly isn't happening. The Vita is effectively dead and Remote Play support is only going to get worse. Bad for us Vita owners, good for Hori and Play Asia.
So: just buy the case already. I knew about it for over a year, played 80+ hours of Nier:Automata almost exclusively over Remote Play, with the terrible touchpad controls, and am now kicking myself for not just spending a few bucks to make those hours more enjoyable. The buttons feel almost as good as the real shoulder buttons -- remarkable, considering how they work -- and I adjusted to having L3/R3 on the rear instead of the front almost immediately.
