Got some MD Games from those Aliexpress sellers to take a look at the quality ..
The boxed ones (20$) Seller ( Fly International Trade ): the lowest quality ever. Insert and Manual : Copy of a copy (that bad) and on top of that made without care. Handcutted from a blind chinese ?
The game boards are too thick and hardly fit into the MD cartridgeport. If you open up a cartridge which is very easy (one came broken already) due the thin plastic & without any screws - you can see the pcb board is nightmare job.
The second seller (futurestore) I got a SFC Repro (RR2) and a MD custommade Crusader of Centy
quite a while ago.
The shown pictures (original Nintendo & Sega boards ) which is not true, he uses the same cheap noname pcb boards like all chinese sellers. Dont order a game that uses "Save" ( Megaman, most adventures ) as he doesnt really care for that details. In total a waste of money, MD Crusader doesnt save, RR2 was working fine. Print quality of the labels is cheap but ok, but also totally different to the one shown in the pictures.
One more seller (new Base point) - where the MD games come in small papercases.
label, cartridgecase are the lowest possible quality, Papercase is inkjet printed. But nothing I would recommend or give a friend as gift.