It is really nice.
My buddy has the KillSwitch case and I honestly prefer the Jsaux. Nicer texture on the grips.
Also love having the slide for the battery on the back.
I hate dealing with cords so I often plug a battery pack in, use it till I drain the battery pack. Then by the time the pack is full - the deck is almost empty. Rinse, Repeat
Alternatively replace them if you're doing the back, and or face, plate swap. I did it with Jsaux Gameboy Purple.
Same result.
I never used them before the swap, and now I use them in every game.
Honestly the deck is always in the case so I don't see the purple but I do notice the back triggers.