As promised here are the results:
Overall the cases are of pretty good quality.

Here is what the case looks like prior to the mod.

Minimal mod required for SNES – took about 30 seconds with the Dremel

Zelda with manual
The case will close with the dust cover on but it will bulge slightly if there is a manual in there. Without the dust cover there is no bulge. I’m pretty sure larger manuals could fit easily.
There cart does not rattle at all.

More modding required for NES. Took about 2 minutes with the Dremel.

Megaman 3 with manual
Closes no problem with manual and dust cover but the manual clips do not press down hard enough to hold the slimmer NES manuals in place

Megaman and Zelda

Spine view
Overall my thoughts are:
They seem more sturdy than UGCs and I think the SNES games look amazing in them.
I find the NES games look weird to me in a black case.
I will probably use these for my SNES games and keep with the UGC for my NES collection.