My case arrived today, and I concur with the above.
Excellent quality (very slightly more flimsy than original sega case)
No plastic smell
Plastic cover is slightly more clear than a sega case - which is a good thing - covers look brighter in there
Cart clips slightly tighter than original sega case - meaning my 1 MSX cart doisnt fit without a fight





Famicom, genesis/megadrive and master system carts all fit like a glove. Not rattling at all.
Intellivision fit in there loosely.
2600/coleco could fit with simple modification.