I just got mine, and it’s immediately obvious how much more comfortable it is. It shifts the weight into your palms much more, and the texture on the hand grips makes it stick to your palms a lot more easily (it increases the manufacturing cost by a fair bit, but unfortunately I think it was necessary).

I had a generic clear case before that added a little bulk, but was still the same shape. I took it off and put it back on so many times unsure of if it was an improvement.

The stylthgrip does add some weight though, and I still noticed some fatigue after a while. The crazy thing is that I felt it more in my palms than my fingers and knuckles, which is unusual and definitely helps the comfort aspect.

One thing to note is that the back paddle risers that the kit comes with has hexagonal indents for grip, which is great until your hands get sweaty. Then it gives that weird sensation you get when you eat a chocolate aero bar, when the chocolate bubbles melt on your tongue. It’s very weird and a little distracting, so I might use 3d printed risers instead.

I’ve been looking for a bit, and it seems the vast majority of hardshell cases are molded to the shape of the caseless steam deck inside.

This one has removable padding inside, allowing you to potentially improvise a solution that fits the stylth grip.

Otherwise, my advice is to search up “steam deck bag” on amazon and there are multiple bags like tomtoc, brother, jsaux, or MVRPDXC that seem to hold onto the midsection of the deck, leaving a fair bit of space around the handgrips where the stylthgrip will fit.