This and good stabs are probably the two biggest improvements that you can make to a drop alt. The foam kit makes a massive difference in reducing the case ping from this keyboard.
It almost feels like cheating, when you use this kit. If you have an original ALT, adding this kit and spapping in pre-lubed switches will improve the keeb sound dramatically. After that, just make sure you tune those stabilizers too
Foam arrived intact, and is reasonably dimensionally accurate to the ALT to not fit oddly in the case. Compared to my ALT V1 without foam, I believe the sound is improved, and I think it is a reasonable purchase.
The overall fit is cut perfectly. It's just puffy enough that you have to compress the foam a little bit in order to screw the case down. This ensures that the foam's dampening power is maximized. The thing I appreciate the most is that this foam kit makes the keyboard feel unbelievably solid with zero feeling of any kind of looseness. It is now a very firm feeling keyboard. If you have a V1 keyboard and want to dampen the sound you would be doing yourself the biggest favor by installing this kit. Absolutely positively highly recommended. I would also recommend putting a small piece of electrical tape between the four metal plates that attach to the removable feet and the bottom case plate to keep the two pieces of metal from rattling against each other.
I recently got the Drop Alt keyboard and instantly realized that it needs a lot of foam to get the most out of it. I got this kit, and it had basically every type of foam you need to fill your Alt. it makes a huge difference in the sound, and since the Alt is not gasket mounted, you can fill it to the brim with foam without compromising any features. Overall, it's a decent kit, but maybe a little expensive.